|
Collaboration Agreements (Period End Balances) (Details) (USD $)
In Millions, unless otherwise specified
|
Mar. 31, 2015
|
Dec. 31, 2014
|
| Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |
|
|
| Intangible Asset Balance |
$ 4,002.4 |
$ 4,067.6 |
| Acceleron |
|
|
| Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |
|
|
| Intangible Asset Balance |
0 |
0 |
| Equity Investment Balance |
175.5 |
179.7 |
| Percentage of Outstanding Equity |
14.00% |
14.00% |
| Epizyme |
|
|
| Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |
|
|
| Intangible Asset Balance |
0 |
0 |
| Equity Investment Balance |
69.0 |
69.3 |
| Percentage of Outstanding Equity |
9.00% |
11.00% |
| FORMA |
|
|
| Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |
|
|
| Intangible Asset Balance |
0.1 |
0.1 |
| Equity Investment Balance |
0 |
0 |
| MorphoSys |
|
|
| Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |
|
|
| Intangible Asset Balance |
0 |
0 |
| Equity Investment Balance |
50.3 |
73.9 |
| Percentage of Outstanding Equity |
3.00% |
3.00% |
| NantBioScience |
|
|
| Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |
|
|
| Intangible Asset Balance |
0 |
0 |
| Equity Investment Balance |
90.0 |
90.0 |
| Percentage of Outstanding Equity |
13.00% |
14.00% |
| Other Collaboration Arrangements |
|
|
| Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |
|
|
| Intangible Asset Balance |
76.0 |
67.7 |
| Equity Investment Balance |
$ 633.2 |
$ 720.8 |