Acquisitions (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		0 Months Ended	1 Months Ended	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Apr. 30, 2014	Jan. 31, 2015	Jun. 30, 2015	Dec. 31, 2014	Jan. 01, 2015
Amortization of Intangible Assets	$ 154.2	$ 131.9
Cost of sales	1,192.7	1,222.7
Interest Expense	40.9	37.8
Restricted cash	0					5,405.6
Payments to Acquire Businesses, Net of Cash Acquired	5,276.7	0
Goodwill	3,946.9					1,758.1
Acquired in-process research and development	256.0	0
Lohmann Animal Health [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets			51.1
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment			89.8
Payments to Acquire Businesses, Net of Cash Acquired			551.4
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt			39.8
Goodwill			243.7
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent			(92.7)
Business Combination, Consideration Transferred			591.2
Novartis Animal Health [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory							386.7
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles							1,940.0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets							294.0
Business Combination, Consideration Transferred							5,292.0
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				19 years
Business Acquisition, Goodwill, Expected Tax Deductible Amount							900
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual	236.4
Business Acquisition, Pro Forma Revenue	4,644.7	4,934.9
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment							218.9
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets held for sale							426.7
Goodwill							2,196.8
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent							(84.9)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities							(86.2)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net							3,095.2
Business Combination, Consideration Transferred				5,290.0
Business Acquisition, Pro Forma Net Income (Loss)	574.9	627.1
Business Acquisition, Pro Forma Earnings Per Share, Diluted	$ 0.54	$ 0.58
Innovent Biologics, Inc. [Member]
Acquired in-process research and development	56.0
Developed Technology Rights [Member] | Lohmann Animal Health [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles			275.4
Customer Relationships [Member] | Lohmann Animal Health [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles			23.9
Tanezumab [Member]
Acquired in-process research and development	200.0
Subsequent Event [Member] | Hanmi Pharmaceutical Co., Ltd. [Member]
Acquired in-process research and development					50.0
Discontinued Operations, Held-for-sale [Member] | United States [Member] | U.S. Sentinel Product Line [Member]
Proceeds from Divestiture of Businesses				410
Amortization of Fair Value Adjusted Intangible Assets [Member] | Novartis Animal Health [Member]
Amortization of Intangible Assets		26.0
Fair Value Adjustment to Inventory [Member] | Novartis Animal Health [Member]
Cost of sales	63.0	(63.5)
Acquisition-related Costs [Member] | Novartis Animal Health [Member]
Interest Expense	20.0
Corporate, Non-Segment [Member]
Amortization of Intangible Assets	(152.7)	0
Acquired in-process research and development	256.0	0
Corporate, Non-Segment [Member] | Fair Value Adjustment to Inventory [Member]
Cost of sales	$ (63.5)	$ 0