Intangible Assets and Goodwill (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Intangible assets
Total intangible assets, gross	$ 4,030,600,000		$ 4,030,600,000		$ 3,807,500,000
Accumulated Amortization	(2,297,600,000)		(2,297,600,000)		(2,199,300,000)
Intangible assets, net	1,732,972,000		1,732,972,000		1,608,191,000
Intangible Assets and Goodwill (Additional Textual) [Abstract]
Intangible asset recognized to reflect the total of upfront and other time-based milestone payments expected to be made	4,030,600,000		4,030,600,000		3,807,500,000
Intangible Assets and Goodwill (Textual) [Abstract]
Amortization of acquired intangible assets	52,282,000	55,136,000	98,243,000	108,352,000
Business acquisition purchase price allocation to IPR&D	219,200,000		219,200,000
Business acquisition purchase price allocation goodwill amount	51,600,000		51,600,000
Accumulated impairment losses related to goodwill	0		0
Maximum [Member]
Intangible Assets and Goodwill (Additional Textual) [Abstract]
Expected future amortization expense, 2013	200,000,000		200,000,000
Expected future amortization expense, 2014	200,000,000		200,000,000
Expected future amortization expense, 2015	200,000,000		200,000,000
Expected future amortization expense, 2016	200,000,000		200,000,000
Minimum [Member]
Intangible Assets and Goodwill (Additional Textual) [Abstract]
Expected future amortization expense, 2013	130,000,000		130,000,000
Expected future amortization expense, 2014	130,000,000		130,000,000
Expected future amortization expense, 2015	130,000,000		130,000,000
Expected future amortization expense, 2016	130,000,000		130,000,000
VP1 Protein [Member]
Intangible assets
Total intangible assets, gross	23,100,000		23,100,000		19,200,000
Intangible Assets and Goodwill (Additional Textual) [Abstract]
Expected usage-based royalties to be earned through 2016 from license agreement			57,500,000
Intangible asset recognized to reflect the total of upfront and other time-based milestone payments expected to be made	23,100,000		23,100,000		19,200,000
Out-licensed patents [Member]
Intangible assets
Cost	578,000,000		578,000,000		578,000,000
Accumulated Amortization	(406,200,000)		(406,200,000)		(391,300,000)
Net	171,800,000		171,800,000		186,700,000
Out-licensed patents [Member] | Maximum [Member]
Intangible assets
Estimated Life, (In Years)			23 years
Out-licensed patents [Member] | Minimum [Member]
Intangible assets
Estimated Life, (In Years)			13 years
Core developed technology [Member]
Intangible assets
Cost	3,005,300,000		3,005,300,000		3,005,300,000
Accumulated Amortization	(1,880,600,000)		(1,880,600,000)		(1,801,100,000)
Net	1,124,700,000		1,124,700,000		1,204,200,000
Core developed technology [Member] | Maximum [Member]
Intangible assets
Estimated Life, (In Years)			23 years
Core developed technology [Member] | Minimum [Member]
Intangible assets
Estimated Life, (In Years)			15 years
In-licensed rights and patents [Member]
Intangible assets
Cost	51,100,000		51,100,000		47,200,000
Accumulated Amortization	(8,700,000)		(8,700,000)		(4,800,000)
Net	42,400,000		42,400,000		42,400,000
In-licensed rights and patents [Member] | Maximum [Member]
Intangible assets
Estimated Life, (In Years)			16 years
In-licensed rights and patents [Member] | Minimum [Member]
Intangible assets
Estimated Life, (In Years)			6 years
Assembled workforce [Member]
Intangible assets
Estimated Life, (In Years)			4 years
Cost	2,100,000		2,100,000		2,100,000
Accumulated Amortization	(2,100,000)		(2,100,000)		(2,100,000)
In-process research and development [Member]
Indefinite-lived Intangible Assets by Major Class [Line Items]
Estimated Life			Up to 15 years upon commercialization
Cost and Net	330,100,000		330,100,000		110,900,000
Trademarks and trade names [Member]
Indefinite-lived Intangible Assets by Major Class [Line Items]
Estimated Life			Indefinite
Cost and Net	$ 64,000,000		$ 64,000,000		$ 64,000,000