Commitments and Contingencies (Collaborative Arrangements) (Details) (Out-licensing Arrangement, USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Out-licensing arrangements
Milestone payments received	$ 1.0	$ 0
Other Revenues
Out-licensing arrangements
Milestone revenues recognized	1.5	0.5
Product Sales
Out-licensing arrangements
Milestone revenues recognized	12.5	14.5
Development Milestone
Out-licensing arrangements
Maximum milestone payment receivable	39.0
Sales Milestone
Out-licensing arrangements
Maximum milestone payment receivable	$ 71.5