Intangible Assets and Goodwill (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Intangible assets
Total intangible assets, gross	$ 4,031,900,000		$ 4,031,900,000		$ 3,807,500,000
Accumulated Amortization	(2,350,700,000)		(2,350,700,000)		(2,199,300,000)
Intangible assets, net	1,681,232,000		1,681,232,000		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	4,031,900,000		4,031,900,000		3,807,500,000
Intangible Assets and Goodwill (Textual) [Abstract]
Amortization of acquired intangible assets	53,013,000	49,347,000	151,256,000	157,699,000
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
Other Goodwill Adjustments	6,800,000		6,800,000		0
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
Expected futured amortization expense, 2017	200,000,000		200,000,000
Minimum [Member]
Intangible Assets and Goodwill (Additional Textual) [Abstract]
Expected future amortization expense, 2013	100,000,000		100,000,000
Expected future amortization expense, 2014	100,000,000		100,000,000
Expected future amortization expense, 2015	100,000,000		100,000,000
Expected future amortization expense, 2016	100,000,000		100,000,000
Expected futured amortization expense, 2017	100,000,000		100,000,000
VP1 Protein [Member]
Intangible assets
Total intangible assets, gross	24,500,000		24,500,000		19,200,000
Intangible Assets and Goodwill (Additional Textual) [Abstract]
Expected usage-based royalties to be earned through 2016 from license agreement			57,000,000
Intangible asset recognized to reflect the total of upfront and other time-based milestone payments expected to be made	24,500,000		24,500,000		19,200,000
Out-licensed patents [Member]
Intangible assets
Cost	578,000,000		578,000,000		578,000,000
Accumulated Amortization	(413,600,000)		(413,600,000)		(391,300,000)
Net	164,400,000		164,400,000		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	(1,924,100,000)		(1,924,100,000)		(1,801,100,000)
Net	1,081,200,000		1,081,200,000		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	52,400,000		52,400,000		47,200,000
Accumulated Amortization	(10,900,000)		(10,900,000)		(4,800,000)
Net	41,500,000		41,500,000		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
Cost	2,100,000		2,100,000		2,100,000
Accumulated Amortization	(2,100,000)		(2,100,000)		(2,100,000)
Net	0		0		0
In-process research and development [Member]
Intangible assets
Estimated Life, (In Years)			15 years
Cost and Net	330,100,000		330,100,000		110,900,000
Accumulated Amortization	0		0		0
Trademarks and trade names [Member]
Intangible assets
Indefinite Lived Intangible Assets Useful Life			Indefinite
Cost and Net	64,000,000		64,000,000		64,000,000
Accumulated Amortization	$ 0		$ 0		$ 0
Assembled workforce [Member]
Intangible assets
Estimated Life, (In Years)			4 years