Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
	Jul. 31, 2012 claim	Mar. 31, 2015	Dec. 31, 2014
Business Acquisition, Contingent Consideration [Line Items]
Contingent consideration		$ 76.5	$ 71.6
Number of claims included in post-payment audit	183
Purchase Obligation		13.9
Accrued Liabilities [Member]
Business Acquisition, Contingent Consideration [Line Items]
Contingent consideration		52.8	27.4
Other Noncurrent Liabilities [Member]
Business Acquisition, Contingent Consideration [Line Items]
Contingent consideration		23.7	44.2
Merck [Member]
Business Acquisition, Contingent Consideration [Line Items]
Additional milestone payment		$ 25.0