Acquisitions and License Agreements (Schedule of Fair Value of Identifiable Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Millions	Sep. 25, 2015	Apr. 16, 2015	Sep. 26, 2014	Aug. 14, 2014	Mar. 19, 2014	Oct. 01, 2012
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]
Goodwill (non-tax deductible)	$ 3,649.4		$ 2,401.9
Therakos
Business Acquisition [Line Items]
Receivables	22.0
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]
Cash	41.3
Inventory	23.5
Intangible assets	1,170.0
Goodwill (non-tax deductible)	437.2
Other assets, current and non-current	42.1
Total assets acquired	1,714.1
Current liabilities	24.7
Unpaid purchase consideration (current)	0.0
Other liabilities (non-current)	0.6
Deferred tax liabilities, net (non-current)	324.3
Contingent consideration (non-current)	0.0
Total Debt	344.8
Total liabilities assumed	694.4
Net assets acquired	$ 1,019.7
Ikaria
Business Acquisition [Line Items]
Receivables		$ 73.8
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]
Cash		77.3
Inventory		26.3
Intangible assets		1,971.0
Goodwill (non-tax deductible)		792.4
Other assets, current and non-current		172.9
Total assets acquired		3,039.9
Current liabilities		32.6
Unpaid purchase consideration (current)		0.0
Other liabilities (non-current)		9.1
Deferred tax liabilities, net (non-current)		623.6
Contingent consideration (non-current)		0.0
Total Debt		1,121.0
Total liabilities assumed		1,786.3
Net assets acquired		$ 1,253.6
Questcor Pharmaceuticals, Inc.
Business Acquisition [Line Items]
Receivables				$ 87.3
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]
Cash				445.1
Inventory				67.9
Intangible assets				5,601.1
Goodwill (non-tax deductible)				1,789.4
Other assets, current and non-current				274.3
Total assets acquired				8,177.8
Current liabilities				168.9
Unpaid purchase consideration (current)				128.8
Other liabilities (non-current)				186.8
Deferred tax liabilities, net (non-current)				1,906.8
Contingent consideration (non-current)				0.0
Total Debt				0.0
Total liabilities assumed				2,391.3
Net assets acquired				$ 5,786.5
Cadence Pharmaceuticals, Inc.
Business Acquisition [Line Items]
Receivables					$ 14.7
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]
Cash					43.2
Inventory					21.0
Intangible assets					1,300.0
Goodwill (non-tax deductible)					318.1
Other assets, current and non-current					18.0
Total assets acquired					1,700.3
Current liabilities					48.8
Unpaid purchase consideration (current)					0.0
Other liabilities (non-current)					0.0
Deferred tax liabilities, net (non-current)					292.3
Contingent consideration (non-current)					0.0
Total Debt					30.0
Total liabilities assumed					371.1
Net assets acquired					$ 1,329.2
CNS Therapeutics, Inc.
Business Acquisition [Line Items]
Receivables						$ 3.3
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]
Cash						3.6
Inventory						0.0
Intangible assets						91.9
Goodwill (non-tax deductible)						24.5
Other assets, current and non-current						9.7
Total assets acquired						129.7
Current liabilities						4.0
Unpaid purchase consideration (current)						0.0
Other liabilities (non-current)						0.0
Deferred tax liabilities, net (non-current)						27.1
Contingent consideration (non-current)						6.9
Total Debt						0.0
Total liabilities assumed						38.0
Net assets acquired						$ 91.7