Acquisitions Acquisitions (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Feb. 28, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Business Acquisition [Line Items]
Contingent consideration		$ 0.0	$ 0.0	$ 274.5	$ 0.0
Convergence Pharmaceuticals
Business Acquisition [Line Items]
Cash portion of consideration	$ 200.1
Contingent consideration	274.5
Total purchase price	$ 474.6