Formation of the Company	12 Months Ended
Dec. 31, 2015
Regulated Operations [Abstract]
Formation of the Company	NOTE 2 — Formation of the Company Allergan plc was incorporated in Ireland on May 16, 2013 as a private limited company and re-registered effective September 20, 2013 as a public limited company. It was established for the purpose of facilitating the business combination between Actavis, Inc. and Warner Chilcott plc (“Warner Chilcott”). On October 1, 2013, pursuant to the transaction agreement dated May 19, 2013 among Actavis, Inc., Warner Chilcott, the Company, Actavis Ireland Holding Limited, Actavis W.C. Holding LLC (now known as Actavis W.C. Holding Inc.) and Actavis W.C. Holding 2 LLC (now known as Actavis W.C. Holding 2 Inc.) (“MergerSub”), (i) the Company acquired Warner Chilcott (the “Warner Chilcott Acquisition”) pursuant to a scheme of arrangement under Section 201, and a capital reduction under Sections 72 and 74, of the Irish Companies Act of 1963 where each Warner Chilcott ordinary share was converted into 0.160 of an Allergan plc ordinary share (the “Company Ordinary Shares”), or $5,833.9 million in equity consideration, and (ii) MergerSub merged with and into Actavis, Inc., with Actavis, Inc. as the surviving corporation in the merger (the “Merger” and, together with the Warner Chilcott Acquisition, the “Transactions”). Following the consummation of the Transactions, Actavis, Inc. and Warner Chilcott became wholly-owned subsidiaries of Allergan plc. Each of Actavis, Inc.’s common shares was converted into one Company Ordinary Share. Effective October 1, 2013, through a series of related-party transactions, Allergan plc contributed its indirect subsidiaries, including Actavis, Inc. to Warner Chilcott Limited. On March 17, 2015, the Company acquired Legacy Allergan for approximately $77.0 billion including outstanding indebtedness assumed of $2.2 billion, cash consideration of $40.1 billion and equity consideration of $34.7 billion, which includes outstanding equity awards (the “Allergan Acquisition”). Under the terms of the agreement, Legacy Allergan shareholders received 111.2 million of the Company’s ordinary shares, 7.0 million of the Company’s non-qualified stock options and 0.5 million of the Company’s share units. In connection with the Allergan Acquisition, the Company changed its name from Actavis plc to Allergan plc. Actavis plc’s ordinary shares were traded on the NYSE under the symbol “ACT” until the opening of trading on June 15, 2015, at which time Actavis plc changed its corporate name to “Allergan plc” and changed its ticker symbol to “AGN.” Pursuant to Rule 12g-3(c) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), Allergan plc is the successor issuer to Actavis plc’s ordinary shares which are deemed to be registered under Section 12(b) of the Exchange Act, and Allergan plc is subject to the informational requirements of the Exchange Act, and the rules and regulations promulgated thereunder. References throughout to “we,” “our,” “us,” the “Company” or “Allergan” refer to financial information and transactions of Watson Pharmaceuticals, Inc. prior to January 23, 2013, Actavis, Inc. from January 23, 2013 until October 1, 2013 and Allergan plc and Warner Chilcott Limited subsequent to October 1, 2013. References throughout to “Ordinary Shares” refer to Actavis, Inc.’s Class A common shares, par value $0.0033 per share, prior to the consummation of the Transactions and to Allergan plc’s ordinary shares, par value $0.0001 per share, since the consummation of the Transactions.

NOTE 2 — Formation of the Company

Allergan plc was incorporated in Ireland on May 16, 2013 as a private limited company and re-registered effective September 20, 2013 as a public limited company. It was established for the purpose of facilitating the business combination between Actavis, Inc. and Warner Chilcott plc (“Warner Chilcott”). On October 1, 2013, pursuant to the transaction agreement dated May 19, 2013 among Actavis, Inc., Warner Chilcott, the Company, Actavis Ireland Holding Limited, Actavis W.C. Holding LLC (now known as Actavis W.C. Holding Inc.) and Actavis W.C. Holding 2 LLC (now known as Actavis W.C. Holding 2 Inc.) (“MergerSub”), (i) the Company acquired Warner Chilcott (the “Warner Chilcott Acquisition”) pursuant to a scheme of arrangement under Section 201, and a capital reduction under Sections 72 and 74, of the Irish Companies Act of 1963 where each Warner Chilcott ordinary share was converted into 0.160 of an Allergan plc ordinary share (the “Company Ordinary Shares”), or $5,833.9 million in equity consideration, and (ii) MergerSub merged with and into Actavis, Inc., with Actavis, Inc. as the surviving corporation in the merger (the “Merger” and, together with the Warner Chilcott Acquisition, the “Transactions”). Following the consummation of the Transactions, Actavis, Inc. and Warner Chilcott became wholly-owned subsidiaries of Allergan plc. Each of Actavis, Inc.’s common shares was converted into one Company Ordinary Share. Effective October 1, 2013, through a series of related-party transactions, Allergan plc contributed its indirect subsidiaries, including Actavis, Inc. to Warner Chilcott Limited.

On March 17, 2015, the Company acquired Legacy Allergan for approximately $77.0 billion including outstanding indebtedness assumed of $2.2 billion, cash consideration of $40.1 billion and equity consideration of $34.7 billion, which includes outstanding equity awards (the “Allergan Acquisition”). Under the terms of the agreement, Legacy Allergan shareholders received 111.2 million of the Company’s ordinary shares, 7.0 million of the Company’s non-qualified stock options and 0.5 million of the Company’s share units.

In connection with the Allergan Acquisition, the Company changed its name from Actavis plc to Allergan plc. Actavis plc’s ordinary shares were traded on the NYSE under the symbol “ACT” until the opening of trading on June 15, 2015, at which time Actavis plc changed its corporate name to “Allergan plc” and changed its ticker symbol to “AGN.” Pursuant to Rule 12g-3(c) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), Allergan plc is the successor issuer to Actavis plc’s ordinary shares which are deemed to be registered under Section 12(b) of the Exchange Act, and Allergan plc is subject to the informational requirements of the Exchange Act, and the rules and regulations promulgated thereunder.

References throughout to “we,” “our,” “us,” the “Company” or “Allergan” refer to financial information and transactions of Watson Pharmaceuticals, Inc. prior to January 23, 2013, Actavis, Inc. from January 23, 2013 until October 1, 2013 and Allergan plc and Warner Chilcott Limited subsequent to October 1, 2013.

References throughout to “Ordinary Shares” refer to Actavis, Inc.’s Class A common shares, par value $0.0033 per share, prior to the consummation of the Transactions and to Allergan plc’s ordinary shares, par value $0.0001 per share, since the consummation of the Transactions.