Acquisitions and License Agreements (Schedule of Intangible Assets Acquired) (Details) - USD ($) $ in Millions	Apr. 16, 2015	Aug. 14, 2014	Mar. 19, 2014
Ikaria, Inc.
Intangible Assets Acquired as Part of Business Combination [Line Items]
Intangible assets	$ 1,971.0
Questcor Pharmaceuticals, Inc.
Intangible Assets Acquired as Part of Business Combination [Line Items]
Intangible assets		$ 5,601.1
Cadence Pharmaceuticals, Inc.
Intangible Assets Acquired as Part of Business Combination [Line Items]
Intangible assets			$ 1,300.0
In-process Research and Development | Terlipressin | Ikaria, Inc.
Intangible Assets Acquired as Part of Business Combination [Line Items]
Discount rate used to value acquired intangible assets	17.00%
Intangible assets	$ 81.0
In-process Research and Development | Synacthen | Questcor Pharmaceuticals, Inc.
Intangible Assets Acquired as Part of Business Combination [Line Items]
Discount rate used to value acquired intangible assets		16.00%
Intangible assets acquired, non-amortizable		$ 218.3
Completed Technology | Inomax | Ikaria, Inc.
Intangible Assets Acquired as Part of Business Combination [Line Items]
Discount rate used to value acquired intangible assets	14.50%
Intangible assets acquired, amortization period	15 years
Intangible assets	$ 1,820.0
Completed Technology | H. P. Acthar Gel | Questcor Pharmaceuticals, Inc.
Intangible Assets Acquired as Part of Business Combination [Line Items]
Discount rate used to value acquired intangible assets		14.50%
Intangible assets acquired		$ 5,343.3
Intangible assets acquired, amortization period		18 years
Completed Technology | Ofirmev | Cadence Pharmaceuticals, Inc.
Intangible Assets Acquired as Part of Business Combination [Line Items]
Discount rate used to value acquired intangible assets			13.00%
Intangible assets acquired			$ 1,300.0
Intangible assets acquired, amortization period			8 years
Trademarks | Ikaria, Inc.
Intangible Assets Acquired as Part of Business Combination [Line Items]
Discount rate used to value acquired intangible assets	14.50%
Intangible assets acquired, amortization period	22 years
Intangible assets	$ 70.0
Trademarks | Questcor Pharmaceuticals, Inc.
Intangible Assets Acquired as Part of Business Combination [Line Items]
Discount rate used to value acquired intangible assets		10.00%
Intangible assets acquired		$ 5.2
Intangible assets acquired, amortization period		13 years
Customer Relationships | Questcor Pharmaceuticals, Inc.
Intangible Assets Acquired as Part of Business Combination [Line Items]
Discount rate used to value acquired intangible assets		10.00%
Intangible assets acquired		$ 34.3
Intangible assets acquired, amortization period		12 years