Debt - Additional Information (Detail) (USD $) In Millions, unless otherwise specified			1 Months Ended	6 Months Ended					6 Months Ended							6 Months Ended		1 Months Ended			6 Months Ended		0 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Oct. 31, 2012 Senior Unsecured Term Loan [Member]	Jun. 30, 2013 Senior Unsecured Term Loan [Member]	Dec. 10, 2012 Senior Unsecured Term Loan [Member]	Jun. 22, 2012 Senior Unsecured Term Loan [Member]	Jun. 30, 2013 Senior Unsecured Term Loan [Member] Federal Funds Rate [Member]	Jun. 30, 2013 Senior Unsecured Term Loan [Member] London Interbank Offered Rate [Member]	Jun. 30, 2013 Senior Unsecured Term Loan [Member] Base rate [Member]	Jun. 30, 2013 Senior Unsecured Term Loan [Member] Eurodollar rate [Member]	Jun. 30, 2013 Revolving Credit Facility [Member]	May 21, 2012 Revolving Credit Facility [Member]	Jun. 30, 2013 Revolving Credit Facility [Member] London Interbank Offered Rate [Member]	Jun. 30, 2013 Revolving Credit Facility [Member] Letters of credit [Member]	Jun. 30, 2013 Revolving Credit Facility [Member] Swingline [Member]	Jun. 30, 2013 Revolving Credit Facility [Member] Base rate loans [Member]	Jun. 30, 2013 Revolving Credit Facility [Member] Eurocurrency Rate Loans [Member]	Oct. 02, 2012 1.875% Senior notes due 2017 [Member]	Oct. 02, 2012 3.250% Senior notes due 2022 [Member]	Oct. 02, 2012 4.625% Senior notes due 2042 [Member]	Jun. 30, 2013 2009 Senior Notes [Member]	Jun. 30, 2013 2012 Senior Notes [Member]	Aug. 24, 2009 5.00% senior notes due 2014 [Member]	Aug. 24, 2009 6.125% Senior notes due 2019 [Member]	Jun. 30, 2013 Senior Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount of senior notes																		$ 1,200.0	$ 1,700.0	$ 1,000.0			$ 450.0	$ 400.0
Senior notes, interest rate																		1.875%	3.25%	4.625%			5.00%	6.125%
Maturity of senior notes																		2017	2022	2042			2014	2019
Redemption of senior notes price equal to principal amount																					100.00%	100.00%
Interest rate basis spread							0.50%	1.00%					1.00%			0.50%		0.20%	0.25%	0.30%	0.40%
Minimum percentage of principal amount of the Senior Notes specified as repurchase price of Senior Notes to be repurchase for cash upon change of control triggering event																					101.00%	101.00%
Senior notes outstanding	6,351.1	6,433.3																			849.0	3,867.3
Redemption price of Senior Notes																					Equal to the greater of (i) 100% of the principal amount of the notes to be redeemed and (ii) the sum of the present values of the remaining scheduled payments of principal and interest in respect of the 2009 Senior Notes being redeemed, discounted on a semi-annual basis at the Treasury Rate plus 40 basis points
Repurchase price of Senior Notes for cash upon a change of control																					101% of the principal amount of the 2009 Senior Notes to be repurchased plus accrued and unpaid interest to the date of purchase
Maximum borrowing capacity						1,800.0						750.0		100.0	50.0
Borrowings outstanding			1,800.0	1,615.0
Debt issuance costs			5.9
Term Loan Credit Agreement prepaid borrowings					100.0
Line of credit facility interest rate description				The base rate is the higher of (a) the Federal Funds Rate plus 0.50%, (b) the prime rate as publicly announced by the Administrative Agent or (c) the one-month London Interbank Offered Rate plus 1.00%
Percentage of margin									0.50%	1.50%						0.25%	1.25%
Term Loan Credit Agreement payment terms				Outstanding principal amount under the Term Loan Credit Agreement is payable in equal quarterly amounts of 2.50% per quarter prior to the fifth anniversary of the closing date of the Actavis Group acquisition (beginning with the quarter ending March 31, 2013), with the remaining balance payable on the maturity date
Quarterly payable principal percentage				2.50%
Commitment fee to maintain availability of funds											0.15%
Applicable margin, for Line of Credit facilities											0.25% for base rate loans and 1.25% for Eurocurrency rate loans
Maximum consolidated leverage ratio permitted prior to the date of acquisition of Actavis Group											3.50
Maximum consolidated leverage ratio permitted in year one after the date of acquisition of Actavis Group											4.25
Maximum consolidated leverage ratio permitted in year two after the date of acquisition of Actavis Group											4.00
Maximum consolidated leverage ratio permitted in year three and thereafter after the date of acquisition of Actavis Group											3.50
Litigation, Settlement and unusual Charges											7.50%
Compliance with covenants under the terms of revolving credit facility											The Company is subject to, and, at June 30, 2013, was in compliance with, all financial and operational covenants under the terms of the Revolving Credit Facility
Net availability under the Revolving Credit Facility											743.3
Outstanding letters of credit											6.7
Fair value of senior notes less than the carrying value																									$ 102.6