Reportable Segments - Schedule of Net Revenues, Operating Expenses Contribution Information by Reportable Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Segment Information [Line Items]
Product sales	$ 1,928.2	$ 1,317.8	$ 3,799.5	$ 2,817.3
Other	61.6	37.4	85.8	62.2
Net revenues	1,989.8	1,355.2	3,885.3	2,879.5
Operating expenses:
Cost of sales	1,050.0	754.0	2,136.2	1,658.3
Research and development	135.6	79.7	267.7	168.2
Selling and marketing	235.6	117.9	462.8	236.0
Contribution	568.6	403.6	1,018.6	817.0
Contibution margin	28.60%	29.80%	26.20%	28.40%
General and administrative	225.8	121.8	411.6	286.2
Amortization	149.6	105.8	308.0	237.7
Loss on asset sales, impairments, and contingent consideration adjustment, net	655.3	79.8	803.3	80.0
Operating income (loss)	(462.1)	96.2	(504.3)	213.1
Operating margin	(23.20%)	7.10%	(13.00%)	7.40%
Actavis Pharma segment [Member]
Segment Information [Line Items]
Product sales	1,525.5	976.0	3,049.6	2,084.0
Other	43.7	19.0	53.4	27.1
Net revenues	1,569.2	995.0	3,103.0	2,111.1
Operating expenses:
Cost of sales	776.8	517.4	1,638.7	1,131.6
Research and development	103.7	53.8	202.5	109.9
Selling and marketing	160.9	52.6	320.2	100.1
Contribution	527.8	371.2	941.6	769.5
Contibution margin	33.60%	37.30%	30.30%	36.50%
Actavis Specialty Brands segment [Member]
Segment Information [Line Items]
Product sales	126.9	100.9	243.1	193.8
Other	17.9	18.4	32.4	35.1
Net revenues	144.8	119.3	275.5	228.9
Operating expenses:
Cost of sales	34.4	28.7	64.2	54.5
Research and development	31.9	25.9	65.2	58.3
Selling and marketing	47.0	42.5	90.6	90.2
Contribution	31.5	22.2	55.5	25.9
Contibution margin	21.80%	18.60%	20.10%	11.30%
Anda Distribution segment [Member]
Segment Information [Line Items]
Product sales	275.8	240.9	506.8	539.5
Other
Net revenues	275.8	240.9	506.8	539.5
Operating expenses:
Cost of sales	238.8	207.9	433.3	472.2
Research and development
Selling and marketing	27.7	22.8	52.0	45.7
Contribution	$ 9.3	$ 10.2	$ 21.5	$ 21.6
Contibution margin	3.40%	4.20%	4.20%	4.00%