Intangible Assets and Goodwill (Details) (USD $)	3 Months Ended	9 Months Ended		12 Months Ended	15 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013
Intangible Assets By Category
Gross Carrying Value	$ 3,850,800,000	$ 3,850,800,000		$ 3,841,400,000	$ 3,850,800,000
Accumulated Amortization	(1,080,500,000)	(1,080,500,000)		(878,900,000)	(1,080,500,000)
Intangible Assets, Net	2,770,300,000	2,770,300,000		2,962,500,000	2,770,300,000
Weighted Average Life (Years)		12 years 6 months		12 years 6 months
Total intangible assets
Gross Carrying Value	3,988,700,000	3,988,700,000		3,979,300,000	3,988,700,000
Intangible Assets, Net	2,908,200,000	2,908,200,000		3,100,400,000	2,908,200,000
Increase in the gross carrying value of the intangible assets		9,400,000
Amortization expense	67,500,000	201,600,000	133,000,000		46,400,000
Summary of changes in carrying value of goodwill
Balance at December 31, 2012		2,042,800,000
Tax benefit on the exercise of Pharmion converted stock options		(700,000)
Balance at September 30, 2013	2,042,100,000	2,042,100,000		2,042,800,000	2,042,100,000
Acquired developed product rights
Intangible Assets By Category
Gross Carrying Value	3,405,900,000	3,405,900,000		3,400,400,000	3,405,900,000
Accumulated Amortization	(973,400,000)	(973,400,000)		(814,500,000)	(973,400,000)
Intangible Assets, Net	2,432,500,000	2,432,500,000		2,585,900,000	2,432,500,000
Weighted Average Life (Years)		13 years		13 years
Total intangible assets
Acquired intangible assets	5,500,000	5,500,000			5,500,000
Technology
Intangible Assets By Category
Gross Carrying Value	333,700,000	333,700,000		333,300,000	333,700,000
Accumulated Amortization	(75,500,000)	(75,500,000)		(39,800,000)	(75,500,000)
Intangible Assets, Net	258,200,000	258,200,000		293,500,000	258,200,000
Weighted Average Life (Years)		7 years		7 years
Licenses
Intangible Assets By Category
Gross Carrying Value	66,200,000	66,200,000		64,300,000	66,200,000
Accumulated Amortization	(12,900,000)	(12,900,000)		(10,000,000)	(12,900,000)
Intangible Assets, Net	53,300,000	53,300,000		54,300,000	53,300,000
Weighted Average Life (Years)		16 years 6 months		16 years 9 months 18 days
Other
Intangible Assets By Category
Gross Carrying Value	45,000,000	45,000,000		43,400,000	45,000,000
Accumulated Amortization	(18,700,000)	(18,700,000)		(14,600,000)	(18,700,000)
Intangible Assets, Net	26,300,000	26,300,000		28,800,000	26,300,000
Weighted Average Life (Years)		8 years 3 months 13 days		8 years 6 months
Total intangible assets
Acquired intangible assets	3,900,000	3,900,000			3,900,000
Acquired IPR&D product rights
Non-amortized intangible assets:
Carrying Value	137,900,000	137,900,000		137,900,000	137,900,000
Minimum
Intangible Assets By Category
Weighted Average Life (Years)		1 year
Total intangible assets
Amortization		255,000,000.0
Maximum
Intangible Assets By Category
Weighted Average Life (Years)		17 years
Total intangible assets
Amortization		$ 270,000,000.0