Commitments and Contingencies (Collaborative Arrangements) (Details) (Out-licensing Arrangement, USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Out-licensing arrangements
Milestone payments received	$ 1.0	$ 3.0
Other Revenues
Out-licensing arrangements
Milestone revenues recognized	2.0	4.0
Product Sales
Out-licensing arrangements
Milestone revenues recognized	26.4	26.3
Development Milestone
Out-licensing arrangements
Maximum milestone payment receivable	39.0
Sales Milestone
Out-licensing arrangements
Maximum milestone payment receivable	$ 71.5