UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13D
Under the Securities and Exchange Act of 1934

(Amendment No. 2)

Armstrong Flooring, Inc.
(Name of Issuer)

Common Stock
(Title of Class of Securities)

04238R106
(CUSIP Number)

Allison Bennington, Esq.
Jason Breeding, Esq.
ValueAct Capital
One Letterman Drive, Building D, Fourth Floor
San Francisco, CA 94129
(415) 362-3700
(Name, address and telephone number of Person
Authorized to Receive Notices and Communications)

June 21, 2019
(Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box [ ].

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See Rule 240.13d-7 for other parties to whom copies are to be sent.

*The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

This information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).


SCHEDULE 13D

--------------------------                          -------------------------
CUSIP NO. 04238R106                                             Page 2 of 14
-----------------------------------------------------------------------------
1. NAME OF REPORTING PERSON/S.S. OR I.R.S. INDENTIFICATION NO. OF ABOVE
   PERSON (entities only)

   ValueAct Capital Master Fund, L.P.
-----------------------------------------------------------------------------
2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                  (a) [X]
                                                                      (b) [ ]
-----------------------------------------------------------------------------
3. SEC USE ONLY

-----------------------------------------------------------------------------
4. SOURCE OF FUNDS (See Instructions)*

   WC*
-----------------------------------------------------------------------------
5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
   PURSUANT TO ITEMS 2(d) or 2(e)                                         [ ]
-----------------------------------------------------------------------------
6. CITIZENSHIP OR PLACE OF ORGANIZATION

   British Virgin Islands
-----------------------------------------------------------------------------
                    7.  SOLE VOTING POWER
                        0
   NUMBER OF       ----------------------------------------------------------
   SHARES           8.  SHARED VOTING POWER
   BENEFICIALLY         1,222,756**
   OWNED BY EACH   ----------------------------------------------------------
   PERSON WITH      9.  SOLE DISPOSITIVE POWER
                        0
                   ----------------------------------------------------------
                   10.  SHARED DISPOSITIVE POWER
                        1,222,756**
-----------------------------------------------------------------------------
11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    1,222,756**
-----------------------------------------------------------------------------
12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
    CERTAIN SHARES                                                        [ ]
-----------------------------------------------------------------------------
13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

   5.7%
-----------------------------------------------------------------------------
14. TYPE OF REPORTING PERSON

    PN
-----------------------------------------------------------------------------
*See Item 3
**See Item 2 and 5


SCHEDULE 13D

--------------------------                          -------------------------
CUSIP NO. 04238R106                                             Page 3 of 14
----------------------------------------------------------------------------
1. NAME OF REPORTING PERSON/S.S. OR I.R.S. INDENTIFICATION NO. OF ABOVE
   PERSON (entities only)

   VA Partners I, LLC
-----------------------------------------------------------------------------
2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                  (a) [X]
                                                                      (b) [ ]
-----------------------------------------------------------------------------
3. SEC USE ONLY

-----------------------------------------------------------------------------
4. SOURCE OF FUNDS*

   00*
-----------------------------------------------------------------------------
5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
   PURSUANT TO ITEMS 2(d) or 2(e)                                         [ ]
-----------------------------------------------------------------------------
6. CITIZENSHIP OR PLACE OF ORGANIZATION

   Delaware
-----------------------------------------------------------------------------
                    7.  SOLE VOTING POWER
                        0
   NUMBER OF       ----------------------------------------------------------
   SHARES           8.  SHARED VOTING POWER
   BENEFICIALLY         1,222,756**
   OWNED BY EACH   ----------------------------------------------------------
   PERSON WITH      9.  SOLE DISPOSITIVE POWER
                        0
                   ----------------------------------------------------------
                   10.  SHARED DISPOSITIVE POWER
                        1,222,756**
-----------------------------------------------------------------------------
11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    1,222,756**
-----------------------------------------------------------------------------
12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
    CERTAIN SHARES                                                        [ ]
-----------------------------------------------------------------------------
13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    5.7%
-----------------------------------------------------------------------------
14. TYPE OF REPORTING PERSON

    00 (LLC)
-----------------------------------------------------------------------------
*See Item 3
**See Item 2 and 5


SCHEDULE 13D

--------------------------                          -------------------------
CUSIP NO. 04238R106                                             Page 4 of 14
----------------------------------------------------------------------------
1. NAME OF REPORTING PERSON/S.S. OR I.R.S. INDENTIFICATION NO. OF ABOVE
   PERSON (entities only)

   ValueAct Capital Management, L.P.
-----------------------------------------------------------------------------
2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                  (a) [X]
                                                                      (b) [ ]
-----------------------------------------------------------------------------
3. SEC USE ONLY

-----------------------------------------------------------------------------
4. SOURCE OF FUNDS*

   00*
-----------------------------------------------------------------------------
5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
   PURSUANT TO ITEMS 2(d) or 2(e)                                         [ ]
-----------------------------------------------------------------------------
6. CITIZENSHIP OR PLACE OF ORGANIZATION

   Delaware
-----------------------------------------------------------------------------
                    7.  SOLE VOTING POWER
                        0
   NUMBER OF       ----------------------------------------------------------
   SHARES           8.  SHARED VOTING POWER
   BENEFICIALLY         1,222,756**
   OWNED BY EACH   ----------------------------------------------------------
   PERSON WITH      9.  SOLE DISPOSITIVE POWER
                        0
                   ----------------------------------------------------------
                   10.  SHARED DISPOSITIVE POWER
                        1,222,756**
-----------------------------------------------------------------------------
11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    1,222,756**
-----------------------------------------------------------------------------
12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
    CERTAIN SHARES                                                        [ ]
-----------------------------------------------------------------------------
13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    5.7%
-----------------------------------------------------------------------------
14. TYPE OF REPORTING PERSON

    PN
-----------------------------------------------------------------------------
*See Item 3
**See Item 2 and 5


SCHEDULE 13D

--------------------------                          -------------------------
CUSIP NO. 04238R106                                             Page 5 of 14
----------------------------------------------------------------------------
1. NAME OF REPORTING PERSON/S.S. OR I.R.S. INDENTIFICATION NO. OF ABOVE
   PERSON (entities only)

   ValueAct Capital Management, LLC
-----------------------------------------------------------------------------
2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                  (a) [X]
                                                                      (b) [ ]
-----------------------------------------------------------------------------
3. SEC USE ONLY

-----------------------------------------------------------------------------
4. SOURCE OF FUNDS*

   00*
-----------------------------------------------------------------------------
5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
   PURSUANT TO ITEMS 2(d) or 2(e)                                         [ ]
-----------------------------------------------------------------------------
6. CITIZENSHIP OR PLACE OF ORGANIZATION

   Delaware
-----------------------------------------------------------------------------
                    7.  SOLE VOTING POWER
                        0
   NUMBER OF       ----------------------------------------------------------
   SHARES           8.  SHARED VOTING POWER
   BENEFICIALLY         1,222,756**
   OWNED BY EACH   ----------------------------------------------------------
   PERSON WITH      9.  SOLE DISPOSITIVE POWER
                        0
                   ----------------------------------------------------------
                   10.  SHARED DISPOSITIVE POWER
                        1,222,756**
-----------------------------------------------------------------------------
11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    1,222,756**
-----------------------------------------------------------------------------
12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
    CERTAIN SHARES                                                        [ ]
-----------------------------------------------------------------------------
13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    5.7%
-----------------------------------------------------------------------------
14. TYPE OF REPORTING PERSON

    00 (LLC)
-----------------------------------------------------------------------------
*See Item 3
**See Item 2 and 5


SCHEDULE 13D

--------------------------                          -------------------------
CUSIP NO. 04238R106                                             Page 6 of 14
-----------------------------------------------------------------------------
1. NAME OF REPORTING PERSON/S.S. OR I.R.S. INDENTIFICATION NO. OF ABOVE
   PERSON (entities only)

   ValueAct Holdings, L.P.
---------------------------------------------------------------------------
2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                  (a) [X]
                                                                      (b) [ ]
-----------------------------------------------------------------------------
3. SEC USE ONLY

---------------------------------------------------------------------------
4. SOURCE OF FUNDS*

   00*
-----------------------------------------------------------------------------
5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
   PURSUANT TO ITEMS 2(d) or 2(e)                                         [ ]
-----------------------------------------------------------------------------
6. CITIZENSHIP OR PLACE OF ORGANIZATION

   Delaware
-----------------------------------------------------------------------------
                    7.  SOLE VOTING POWER
                        0
   NUMBER OF       ----------------------------------------------------------
   SHARES           8.  SHARED VOTING POWER
   BENEFICIALLY         1,222,756**
   OWNED BY EACH   ----------------------------------------------------------
   PERSON WITH      9.  SOLE DISPOSITIVE POWER
                        0
                   ----------------------------------------------------------
                   10.  SHARED DISPOSITIVE POWER
                        1,222,756**
-----------------------------------------------------------------------------
11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    1,222,756**
-----------------------------------------------------------------------------
12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
    CERTAIN SHARES                                                        [ ]
-----------------------------------------------------------------------------
13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    5.7%
-----------------------------------------------------------------------------
14. TYPE OF REPORTING PERSON

    PN
-----------------------------------------------------------------------------
*See Item 3
**See Items 2 and 5


SCHEDULE 13D

--------------------------                          -------------------------
CUSIP NO. 04238R106                                             Page 7 of 14
-----------------------------------------------------------------------------
1. NAME OF REPORTING PERSON/S.S. OR I.R.S. INDENTIFICATION NO. OF ABOVE
   PERSON (entities only)

   ValueAct Holdings II, L.P.
---------------------------------------------------------------------------
2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                  (a) [X]
                                                                      (b) [ ]
-----------------------------------------------------------------------------
3. SEC USE ONLY

---------------------------------------------------------------------------
4. SOURCE OF FUNDS*

   00*
-----------------------------------------------------------------------------
5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
   PURSUANT TO ITEMS 2(d) or 2(e)                                         [ ]
-----------------------------------------------------------------------------
6. CITIZENSHIP OR PLACE OF ORGANIZATION

   Delaware
-----------------------------------------------------------------------------
                    7.  SOLE VOTING POWER
                        0
   NUMBER OF       ----------------------------------------------------------
   SHARES           8.  SHARED VOTING POWER
   BENEFICIALLY         1,222,756**
   OWNED BY EACH   ----------------------------------------------------------
   PERSON WITH      9.  SOLE DISPOSITIVE POWER
                        0
                   ----------------------------------------------------------
                   10.  SHARED DISPOSITIVE POWER
                        1,222,756**
-----------------------------------------------------------------------------
11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    1,222,756**
-----------------------------------------------------------------------------
12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
    CERTAIN SHARES                                                        [ ]
-----------------------------------------------------------------------------
13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    5.7%
-----------------------------------------------------------------------------
14. TYPE OF REPORTING PERSON

    PN
-----------------------------------------------------------------------------
*See Item 3
**See Items 2 and 5


SCHEDULE 13D

--------------------------                          -------------------------
CUSIP NO. 04238R106                                             Page 8 of 14
-----------------------------------------------------------------------------
1. NAME OF REPORTING PERSON/S.S. OR I.R.S. INDENTIFICATION NO. OF ABOVE
   PERSON (entities only)

   ValueAct Holdings GP, LLC
---------------------------------------------------------------------------
2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                  (a) [X]
                                                                      (b) [ ]
-----------------------------------------------------------------------------
3. SEC USE ONLY

-----------------------------------------------------------------------------
4. SOURCE OF FUNDS*

   00*
-----------------------------------------------------------------------------
5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
   PURSUANT TO ITEMS 2(d) or 2(e)                                        [ ]
-----------------------------------------------------------------------------
6. CITIZENSHIP OR PLACE OF ORGANIZATION

   Delaware
-----------------------------------------------------------------------------
                   7.  SOLE VOTING POWER
                        0
   NUMBER OF       ----------------------------------------------------------
   SHARES          8.  SHARED VOTING POWER
   BENEFICIALLY        1,222,756**
   OWNED BY EACH   ----------------------------------------------------------
   PERSON WITH     9.  SOLE DISPOSITIVE POWER
                        0
                   ----------------------------------------------------------
                   10.  SHARED DISPOSITIVE POWER
                        1,222,756**
-----------------------------------------------------------------------------
11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    1,222,756**
-----------------------------------------------------------------------------
12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
    CERTAIN SHARES                                                        [ ]
-----------------------------------------------------------------------------
13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    5.7%
-----------------------------------------------------------------------------
14. TYPE OF REPORTING PERSON

    00 (LLC)
-----------------------------------------------------------------------------
*See Item 3
**See Items 2 and 5


SCHEDULE 13D

--------------------------                          -------------------------
CUSIP NO. 04238R106                                             Page 9 of 14
-----------------------------------------------------------------------------

     This Amendment No. 2 to the Schedule 13D supplements the information
set forth in the Schedule 13D filed by the Reporting Persons with the United
States Securities and Exchange Commission (the "SEC"), as amended from time
to time (the "Schedule 13D"), relating to the common stock (the "Common
Stock") of Armstrong Flooring, Inc., a Delaware corporation (the "Issuer").
Capitalized terms contained herein but not otherwise defined shall have the
meanings ascribed to such terms in the Schedule 13D.

     The information set forth in response to each separate Item below shall
be deemed to be a response to all Items where such information is relevant.
The Schedule 13D is hereby supplementally amended as follows:

Item 2.     Identity and Background

     This statement is filed jointly by (a) ValueAct Capital Master Fund,
L.P. ("ValueAct Master Fund"), (b) VA Partners I, LLC ("VA Partners I"),
(c) ValueAct Capital Management, L.P. ("ValueAct Management L.P."), (d)
ValueAct Capital Management, LLC ("ValueAct Management LLC"), (e) ValueAct
Holdings, L.P. ("ValueAct Holdings"), (f) ValueAct Holdings II, L.P.
("ValueAct Holdings II"), and (g) ValueAct Holdings GP, LLC ("ValueAct
Holdings GP") (collectively, the "Reporting Persons").

     ValueAct Master Fund is a limited partnership organized under the laws
of the British Virgin Islands.  VA Partners I is a Delaware limited liability
company, the principal business of which is to serve as the General Partner
to ValueAct Master Fund. ValueAct Management L.P. is a Delaware limited
partnership which renders management services to ValueAct Master Fund.
ValueAct Management LLC is a Delaware limited liability company, the
principal business of which is to serve as the General Partner to ValueAct
Management L.P. ValueAct Holdings is a Delaware limited partnership and is
the majority owner of the membership interests of VA Partners I.  ValueAct
Holdings II is the sole owner of the limited partnership interests of
ValueAct Management L.P. and the membership interests of ValueAct Management
LLC. ValueAct Holdings GP is a Delaware limited liability company, the
principal business of which is to serve as the General Partner to ValueAct
Holdings and ValueAct Holdings II.

     The address of the principal business and principal office of each of
the Reporting Persons is One Letterman Drive, Building D, Fourth Floor, San
Francisco, CA 94129.

     (d) and (e). None of the entities or persons identified in this Item 2
has during the past five years been convicted of any criminal proceeding
(excluding traffic violations or similar misdemeanors), nor been a party to a
civil proceeding of a judicial or administrative body of competent judgment,
decree or final order enjoining future violations of, or prohibiting or
mandating activities subject to, federal or state securities laws or finding
any violation with respect to such laws.

Item 4.         Purpose of Transaction

        Item 4 of the Schedule 13D is hereby amended and supplemented by the
addition of the following:


--------------------------                          -------------------------
CUSIP NO. 04238R106                                             Page 10 of 14
-----------------------------------------------------------------------------

        The Issuer offered on May 17, 2019 to purchase for cash up to
$50,000,000.00 of its Common Stock at a purchase price to be determined
according to the terms of the offer (the ?Tender Offer?). On June 21, 2019,
the Issuer issued a press release announcing the final results of the Tender
Offer.  On June 21, 2019, ValueAct Master Fund was informed that 3,399,925
shares held by ValueAct Master Fund were accepted by the Issuer at a price of
$11.10.

Item 5.    Interest in Securities of the Issuer

     The responses to Items 3, 4 and 6 of this Schedule 13D are incorporated
herein by reference.

     (a) and (b). Set forth below is the beneficial ownership of shares of
Common Stock of the Issuer for each person named in Item 2. Shares reported
as beneficially owned by ValueAct Master Fund are also reported as
beneficially owned by (i) ValueAct Management L.P. as the manager of each
such investment partnership, (ii) ValueAct Management LLC, as General
Partner of ValueAct Management L.P., (iii) ValueAct Holdings, as the majority
owner of the membership interests of VA Partners I, (iv) ValueAct Holdings
II, as the sole owner of the limited partnership interests of ValueAct
Management L.P. and the membership interests of ValueAct Management LLC, and
(v) ValueAct Holdings GP, as General Partner of ValueAct Holdings and
ValueAct Holdings II.  Shares reported as beneficially owned by ValueAct
Master Fund are also reported as beneficially owned by VA Partners I, as
General Partner of ValueAct Master Fund.  VA Partners I, ValueAct Management
L.P., ValueAct Management LLC, ValueAct Holdings, ValueAct Holdings II, and
ValueAct Holdings GP also, directly or indirectly, may own interests in one
or more than one of the partnerships from time to time.  Unless otherwise
indicated below, by reason of such relationship ValueAct Master Fund is
reported as having shared power to vote or to direct the vote, and shared
power to dispose or direct the disposition of, such shares of Common Stock,
with VA Partners I (only with respect to ValueAct Master Fund), ValueAct
Management L.P., ValueAct Management LLC, ValueAct Holdings, ValueAct
Holdings II, and ValueAct Holdings GP.

     As of the date hereof, the Reporting Persons may be deemed to be the
beneficial owner of 1,222,756 shares of Common Stock, representing
approximately 5.7% of the Issuer's outstanding Common Stock. All percentages
set forth in this Schedule 13D are based upon 21,609,380 shares of Common
Stock outstanding, which is the Issuer's reported 26,113,884 outstanding
shares of Common Stock as of May 14, 2019 as reported in the Issuer's Tender
Offer Statement on Schedule TO, filed with the Securities and Exchange
Commission on May 17, 2019 less 4,504,504 shares of Common Stock reported to
have been repurchased by the Issuer based on the Issuer's press release dated
as of June 21, 2019.

     (c) Except as disclosed in Item 4 hereto, the Reporting Person has not
effected any transactions in securities of the Issuer in the past sixty days.

     (d) and (e)  Not applicable.


--------------------------                          -------------------------
CUSIP NO. 04238R106                                             Page 11 of 14
-----------------------------------------------------------------------------

Item 7.     Material to Be Filed as Exhibits

(1) Joint Filing Agreement.


                                  SIGNATURE
     After reasonable inquiry and to the best of his knowledge and belief,
the undersigned certifies that the information set forth in this statement is
true, complete and correct.

                              POWER OF ATTORNEY

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears
below on this Schedule 13D hereby constitutes and appoints Jeffrey W. Ubben,
Bradley E. Singer, G. Mason Morfit and Jason B. Breeding, and each of them,
with full power to act without the other, his or its true and lawful
attorney-in-fact and agent, with full power of substitution and
resubstitution, for him or it and in his or its name, place and stead, in any
and all capacities (until revoked in writing) to sign any and all amendments
to this Schedule 13D, and to file the same, with all exhibits thereto and
other documents in connection therewith, with the Securities and Exchange
Commission, granting unto said attorneys-in-fact and agents, and each of
them, full power and authority to do and perform each and every act and thing
requisite and necessary fully to all intents and purposes as he or it might
or could do in person, thereby ratifying and confirming all that said
attorneys-in-fact and agents or any of them, or their or his substitute or
substitutes, may lawfully do or cause to be done by virtue hereof.


SCHEDULE 13D

--------------------------                          -------------------------
CUSIP NO. 04238R106                                             Page 12 of 14
-----------------------------------------------------------------------------

                                ValueAct Capital Master Fund L.P., by
                                VA Partners I, LLC, its General Partner

                              By:     /s/  Bradley E. Singer
                                --------------------------------------
Dated:  June 21, 2019           Bradley E. Singer, Chief Operating Officer


                                VA Partners I, LLC

                              By:     /s/  Bradley E. Singer
                                --------------------------------------
Dated:  June 21, 2019           Bradley E. Singer, Chief Operating Officer


                                ValueAct Capital Management, L.P., by
                                ValueAct Capital Management, LLC its General
                                Partner

                              By:     /s/  Bradley E. Singer
                                --------------------------------------
Dated:  June 21, 2019           Bradley E. Singer, Chief Operating Officer


                                ValueAct Capital Management, LLC

                              By:     /s/  Bradley E. Singer
                                --------------------------------------
Dated:  June 21, 2019           Bradley E. Singer, Chief Operating Officer


                                ValueAct Holdings, L.P., by ValueAct Holdings
                                GP, LLC, its General Partner

                              By:     /s/  Bradley E. Singer
                                --------------------------------------
Dated:  June 21, 2019           Bradley E. Singer, Chief Operating Officer


                                ValueAct Holdings II, L.P., by ValueAct
                                Holdings GP, LLC, its General Partner

                                By:    /s/  Bradley E. Singer
                                --------------------------------------
Dated:  June 21, 2019           Bradley E. Singer, Chief Operating Officer


                                ValueAct Holdings GP, LLC

                              By:     /s/  Bradley E. Singer
                                --------------------------------------
Dated:  June 21, 2019           Bradley E. Singer, Chief Operating Officer


SCHEDULE 13D

--------------------------                          -------------------------
CUSIP NO. 04238R106                                             Page 13 of 14
-----------------------------------------------------------------------------


                                   Exhibit 1

                           JOINT FILING UNDERTAKING

The undersigned parties hereby agree that the Schedule 13D filed herewith
(and any amendments thereto) relating to the Common Stock of the Issuer, is
being filed jointly on behalf of each of them with the Securities and
Exchange Commission pursuant to Section 13(d) of the Securities Exchange Act
of 1934, as amended.

                                ValueAct Capital Master Fund, L.P., by
                                VA Partners I, LLC, its General Partner

                                By:     /s/  Bradley E. Singer
                                --------------------------------------
Dated:  June 21, 2019            Bradley E. Singer, Chief Operating Officer

                                VA Partners I, LLC

                                By:    /s/  Bradley E. Singer
                                --------------------------------------
Dated:  June 21, 2019            Bradley E. Singer, Chief Operating Officer


                                ValueAct Capital Management, L.P., by
                                ValueAct Capital Management, LLC its General
                                Partner

                                By:    /s/  Bradley E. Singer
                                --------------------------------------
Dated:  June 21, 2019            Bradley E. Singer, Chief Operating Officer


                                ValueAct Capital Management, LLC

                                By:    /s/  Bradley E. Singer
                                --------------------------------------
Dated:  June 21, 2019            Bradley E. Singer, Chief Operating Officer


                                ValueAct Holdings, L.P., by ValueAct Holdings
                                GP, LLC, its General Partner

                                By:    /s/  Bradley E. Singer
                                --------------------------------------
Dated:  June 21, 2019            Bradley E. Singer, Chief Operating Officer


SCHEDULE 13D

--------------------------                          -------------------------
CUSIP NO. 04238R106                                             Page 14 of 14
-----------------------------------------------------------------------------

                                ValueAct Holdings II, L.P., by ValueAct
                                Holdings GP, LLC, its General Partner

                                By:    /s/  Bradley E. Singer
                                --------------------------------------
Dated:  June 21, 2019            Bradley E. Singer, Chief Operating Officer


                                ValueAct Holdings GP, LLC

                                By:    /s/  Bradley E. Singer
                                --------------------------------------
Dated:  June 21, 2019            Bradley E. Singer, Chief Operating Officer

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