Commitments and Contingencies (Collaborative Arrangements) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
In-licensing Arrangement | Stategic licensing and collaboration agreement ArmaGen
In-licensing arrangements
Upfront payment	$ 15.0
Maximum conditional obligation	208.0
Out-licensing Arrangement
Out-licensing arrangements
Milestone payments received	1.0	3.0
Out-licensing Arrangement | Other Revenues
Out-licensing arrangements
Milestone revenues recognized	3.6	4.5
Out-licensing Arrangement | Product Sales
Out-licensing arrangements
Milestone revenues recognized	39.8	43.8
Out-licensing Arrangement | Development Milestone
Out-licensing arrangements
Maximum milestone payment receivable	39.0
Out-licensing Arrangement | Sales Milestone
Out-licensing arrangements
Maximum milestone payment receivable	$ 71.5