Commitments and Contingencies (Collaborative Arrangements) (Details) - Out-licensing Arrangement - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Out-licensing arrangements
Milestone payments received	$ 0.5	$ 12.6
Other Revenues
Out-licensing arrangements
Milestone revenues recognized	1.3	0.5
Product Sales
Out-licensing arrangements
Milestone revenues recognized	15.1	$ 9.2
Development Milestone
Out-licensing arrangements
Maximum milestone payment receivable	32.0
Sales Milestone
Out-licensing arrangements
Maximum milestone payment receivable	$ 42.0