Formation of the Company	12 Months Ended
Dec. 31, 2016
Regulated Operations [Abstract]
Formation of the Company	NOTE 2 — Formation of the Company Allergan plc (formerly known as Actavis 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 Allergan Finance, LLC (formerly known as Actavis, Inc.) and Warner Chilcott plc (“Warner Chilcott”). On October 1, 2013, pursuant to the transaction agreement dated May 19, 2013 among Allergan Finance, LLC (formerly known as 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.), (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) Actavis W.C. Holding 2 Inc. merged with and into Allergan Finance, LLC, with Allergan Finance, LLC as the surviving corporation in the merger (the “Merger” and, together with the Warner Chilcott Acquisition, the “Warner Chilcott Transactions”). Following the consummation of the Warner Chilcott Transactions, Allergan Finance, LLC and Warner Chilcott became wholly-owned subsidiaries of Allergan plc. Each of Allergan Finance, LLC’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 Allergan Finance, LLC, to its subsidiary Warner Chilcott Limited. Except where otherwise indicated, and excluding certain insignificant cash and non-cash transactions at the Allergan plc level, the consolidated financial statements and disclosures are for two separate registrants, Allergan plc and Warner Chilcott Limited. The results of Warner Chilcott Limited are consolidated into the results of Allergan plc. Due to the deminimis activity between Allergan plc and Warner Chilcott Limited, references throughout this document relate to both Allergan plc and Warner Chilcott Limited. Refer to “Note 3 —Reconciliation of Warner Chilcott Limited results to Allergan plc results” in the accompanying “Notes to the Consolidated Financial Statements” in this document for a summary of the details on the differences between Allergan plc and 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. The addition of Legacy Allergan’s therapeutic franchises in ophthalmology, neurosciences and medical aesthetics/dermatology/plastic surgery complements the Company’s existing central nervous system, gastroenterology, women’s health and urology franchises. The combined company benefits from Legacy Allergan’s global brand equity and consumer awareness of key products, including Botox^® and Restasis^®. The transaction expanded our presence and market and product reach across many international markets, with strengthened commercial positions across Canada, Europe, Southeast Asia and other high-value growth markets, including China, India, the Middle East and Latin America. 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 Allergan plc. References to “Warner Chilcott Limited” refer to Warner Chilcott Limited, the Company’s indirect wholly-owned subsidiary, and, unless the context otherwise requires, its subsidiaries. References throughout to “Ordinary Shares” refer to Allergan Finance, LLC’s Class A common shares, par value $0.0033 per share, prior to the consummation of the Warner Chilcott Transactions and to Allergan plc’s ordinary shares, par value $0.0001 per share, since the consummation of the Warner Chilcott Transactions.

NOTE 2 — Formation of the Company

Allergan plc (formerly known as Actavis 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 Allergan Finance, LLC (formerly known as Actavis, Inc.) and Warner Chilcott plc (“Warner Chilcott”). On October 1, 2013, pursuant to the transaction agreement dated May 19, 2013 among Allergan Finance, LLC (formerly known as 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.), (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) Actavis W.C. Holding 2 Inc. merged with and into Allergan Finance, LLC, with Allergan Finance, LLC as the surviving corporation in the merger (the “Merger” and, together with the Warner Chilcott Acquisition, the “Warner Chilcott Transactions”). Following the consummation of the Warner Chilcott Transactions, Allergan Finance, LLC and Warner Chilcott became wholly-owned subsidiaries of Allergan plc. Each of Allergan Finance, LLC’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 Allergan Finance, LLC, to its subsidiary Warner Chilcott Limited.

Except where otherwise indicated, and excluding certain insignificant cash and non-cash transactions at the Allergan plc level, the consolidated financial statements and disclosures are for two separate registrants, Allergan plc and Warner Chilcott Limited. The results of Warner Chilcott Limited are consolidated into the results of Allergan plc. Due to the deminimis activity between Allergan plc and Warner Chilcott Limited, references throughout this document relate to both Allergan plc and Warner Chilcott Limited. Refer to “Note 3 —Reconciliation of Warner Chilcott Limited results to Allergan plc results” in the accompanying “Notes to the Consolidated Financial Statements” in this document for a summary of the details on the differences between Allergan plc and 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. The addition of Legacy Allergan’s therapeutic franchises in ophthalmology, neurosciences and medical aesthetics/dermatology/plastic surgery complements the Company’s existing central nervous system, gastroenterology, women’s health and urology franchises. The combined company benefits from Legacy Allergan’s global brand equity and consumer awareness of key products, including Botox^® and Restasis^®. The transaction expanded our presence and market and product reach across many international markets, with strengthened commercial positions across Canada, Europe, Southeast Asia and other high-value growth markets, including China, India, the Middle East and Latin America.

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 Allergan plc. References to “Warner Chilcott Limited” refer to Warner Chilcott Limited, the Company’s indirect wholly-owned subsidiary, and, unless the context otherwise requires, its subsidiaries.

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