Business Combinations, Dispositions and Other Strategic Investments - Consideration Paid For VersaPharm (Details) - USD ($)			3 Months Ended											6 Months Ended			9 Months Ended			12 Months Ended
	Aug. 12, 2014	Aug. 04, 2014	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Mar. 31, 2013	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Apr. 17, 2014
Business Acquisition [Line Items]
Acquisition related expense			$ 129,000	$ 230,000	$ 225,000	$ 1,257,000	$ 3,287,000	$ 8,159,000	$ 20,940,000	$ 454,000	$ 934,000	$ 1,459,000	$ 519,000	$ 1,482,000	$ 21,394,000	$ 519,000	$ 1,712,000	$ 29,553,000	$ 1,978,000	$ 1,841,000	$ 32,840,000	$ 2,912,000
Goodwill			284,710,000	$ 284,708,000	$ 285,356,000	$ 285,674,000	$ 285,283,000	$ 285,881,000	$ 186,365,000	$ 30,437,000	$ 29,831,000			$ 285,356,000	$ 186,365,000		$ 284,708,000	$ 285,881,000		284,710,000	285,283,000	29,831,000
VersaPharm [Member]
Business Acquisition [Line Items]
Amount of cash paid	$ 433,000,000
Acquisition related expense	7,000,000																			500,000	8,100,000
Proceeds from sale of pending product rights		$ 1,000,000
Gain (Loss) on Disposition of Intangible Assets																					800,000
Cash and cash equivalents	100,000
Accounts receivable	3,100,000
Inventory	21,000,000
Other current assets	2,800,000
Property and equipment	1,500,000
Goodwill	100,000,000
Total assets acquired	597,800,000
Assumed current liabilities	(12,200,000)
Assumed non-current liabilities	(81,800,000)
Deferred tax liabilities	(153,200,000)
Total liabilities assumed	(247,200,000)
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	350,600,000
Goodwill and other intangible assets expected to be deducted for tax purposes in future periods			43,200,000																	43,200,000
Net revenue recorded since acquisition																				$ 63,900,000	24,500,000
Weighted average amortization period																				11 years 4 months 24 days
Hi-Tech Pharmacal Co., Inc [Member]
Business Acquisition [Line Items]
Acquisition related expense																				$ 800,000	21,300,000	$ 1,600,000
Debt Instrument, Face Amount																							$ 600,000,000
Cash and cash equivalents																							89,700,000
Accounts receivable																							48,600,000
Inventory																							52,400,000
Other current assets																							34,000,000
Property and equipment																							45,200,000
Goodwill																							171,300,000
Total assets acquired																							796,600,000
Assumed current liabilities																							(22,600,000)
Assumed non-current liabilities																							(3,300,000)
Deferred tax liabilities																							(121,100,000)
Total liabilities assumed																							(147,000,000)
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net																							649,600,000
Goodwill and other intangible assets expected to be deducted for tax purposes in future periods			$ 18,900,000																	18,900,000
Net revenue recorded since acquisition																				$ 324,500,000	$ 150,700,000
Weighted average amortization period																				15 years 7 months 6 days
Initial Fair Valuation [Member] | VersaPharm [Member]
Business Acquisition [Line Items]
Amount of cash paid	440,000,000
Product Licensing Rights [Member] | VersaPharm [Member]
Business Acquisition [Line Items]
Intangible assets	250,800,000
Weighted average amortization period																				11 years 4 months 24 days
Product Licensing Rights [Member] | Hi-Tech Pharmacal Co., Inc [Member]
Business Acquisition [Line Items]
Intangible assets																							339,600,000
Weighted average amortization period																				15 years 8 months 12 days
Intangibles Other [Member] | VersaPharm [Member]
Business Acquisition [Line Items]
Intangible assets	5,200,000
Weighted average amortization period																				11 years
Trademarks [Member] | VersaPharm [Member]
Business Acquisition [Line Items]
Intangible assets	1,000,000
Weighted average amortization period																				3 years
Trademarks [Member] | Hi-Tech Pharmacal Co., Inc [Member]
Business Acquisition [Line Items]
Intangible assets																							5,500,000
Weighted average amortization period																				9 years
IPR&D [Member] | VersaPharm [Member]
Business Acquisition [Line Items]
Intangible assets	212,300,000
IPR&D [Member] | Hi-Tech Pharmacal Co., Inc [Member]
Business Acquisition [Line Items]
Intangible assets																							9,400,000
Customer Relationships [Member] | Hi-Tech Pharmacal Co., Inc [Member]
Business Acquisition [Line Items]
Intangible assets																							$ 300,000
Weighted average amortization period																				1 year
Cash Paid To VersaPharm Stockholder [Member] | VersaPharm [Member]
Business Acquisition [Line Items]
Amount of cash paid	322,700,000
Cash Paid To VersaPharm Option Holders [Member] | VersaPharm [Member]
Business Acquisition [Line Items]
Amount of cash paid	14,200,000
Cash Paid To Escrow [Member] | VersaPharm [Member]
Business Acquisition [Line Items]
Amount of cash paid	10,300,000
Transaction Expenses Paid For Previous Owners Of VersaPharm [Member] | VersaPharm [Member]
Business Acquisition [Line Items]
Amount of cash paid	3,400,000
Cash Paid At Closing Excluding Debt Payoff [Member] | VersaPharm [Member]
Business Acquisition [Line Items]
Amount of cash paid	350,600,000
Cash Paid To Pay Off VersaPharm Debt [Member] | VersaPharm [Member]
Business Acquisition [Line Items]
Amount of cash paid	82,400,000
Term Loan Facility [Member] | VersaPharm [Member]
Business Acquisition [Line Items]
Debt Instrument, Face Amount	$ 445,000,000