|
Intangible Assets (Narrative) (Details) (USD $)
|
3 Months Ended | ||
|---|---|---|---|
|
Mar. 31, 2012
|
Mar. 31, 2011
|
Dec. 31, 2011
|
|
| Acquired Finite-Lived Intangible Assets [Line Items] | |||
| Amortization expense | $ 15,800,000 | $ 17,400,000 | |
| Indefinite-lived intangible assets | 10,986,200,000 | 266,200,000 | |
|
IPR&D [Member] | Pharmasset [Member]
|
|||
| Acquired Finite-Lived Intangible Assets [Line Items] | |||
| Indefinite-lived intangible assets | 10,720,000,000 | ||
|
IPR&D [Member] | Arresto Biosciences Inc [Member]
|
|||
| Acquired Finite-Lived Intangible Assets [Line Items] | |||
| Indefinite-lived intangible assets | 117,000,000 | ||
|
IPR&D [Member] | Calistoga Pharmaceuticals Inc [Member]
|
|||
| Acquired Finite-Lived Intangible Assets [Line Items] | |||
| Indefinite-lived intangible assets | $ 149,200,000 | ||