Acquisitions and License Agreements (Schedule of Reconciliation of Total Consideration to Net Assets Acquired) (Details) - USD ($) $ in Millions	Apr. 16, 2015	Aug. 14, 2014	Mar. 19, 2014
Ikaria, Inc.
Business Acquisition [Line Items]
Total consideration, net of cash	$ 1,176.3
Plus: cash assumed in acquisition	77.3
Total consideration	1,253.6
Less: unpaid purchase consideration	0.0
Net assets acquired	$ 1,253.6
Questcor Pharmaceuticals, Inc.
Business Acquisition [Line Items]
Total consideration, net of cash		$ 5,470.2
Plus: cash assumed in acquisition		445.1
Total consideration		5,915.3
Less: unpaid purchase consideration		(128.8)
Net assets acquired		$ 5,786.5
Cadence Pharmaceuticals, Inc.
Business Acquisition [Line Items]
Total consideration, net of cash			$ 1,286.0
Plus: cash assumed in acquisition			43.2
Total consideration			1,329.2
Less: unpaid purchase consideration			0.0
Net assets acquired			$ 1,329.2