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Acquisitions and Divestitures - Measurement Period Adjustments (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jun. 27, 2015	Mar. 30, 2015
Measurement period adjustments
Goodwill	$ 4,175.4	$ 4,049.4	$ 5,152.7	$ 4,721.2
Omega
Measurement period adjustments
Accounts receivable					$ 222.9
Inventories					277.0
Property, plant and equipment, net					130.8
Goodwill					1,688.7
Intangible assets:
Total intangible assets			3,379.0		3,379.0
Accrued liabilities					49.3
Net deferred income tax liabilities					785.5
Other non-current liabilities					59.9
Previously Reported \| Omega
Measurement period adjustments
Accounts receivable				227.4
Inventories				288.9
Property, plant and equipment, net				121.2
Goodwill				1,269.6
Intangible assets:
Total intangible assets				3,806.8
Accrued liabilities				50.0
Net deferred income tax liabilities				771.1
Other non-current liabilities				88.9
Measurement Period Adjustments \| Omega
Measurement period adjustments
Accounts receivable			(4.5)
Inventories			(11.9)
Property, plant and equipment, net			9.6
Goodwill			419.1
Intangible assets:
Total intangible assets			(427.8)
Accrued liabilities			(0.7)
Net deferred income tax liabilities			14.4
Other non-current liabilities			(29.0)
Developed product technology, formulations, and product rights \| Omega
Intangible assets:
Definite-lived intangibles					31.4
Developed product technology, formulations, and product rights \| Previously Reported \| Omega
Intangible assets:
Definite-lived intangibles				36.9
Developed product technology, formulations, and product rights \| Measurement Period Adjustments \| Omega
Intangible assets:
Definite-lived intangibles			(5.5)
Customer relationships and distribution networks \| Omega
Intangible assets:
Definite-lived intangibles					1,056.3
Customer relationships and distribution networks \| Previously Reported \| Omega
Intangible assets:
Definite-lived intangibles				1,342.7
Customer relationships and distribution networks \| Measurement Period Adjustments \| Omega
Intangible assets:
Definite-lived intangibles			(286.4)
Trademarks, trade names, and brands \| Omega
Intangible assets:
Definite-lived intangibles					287.5
Trademarks, trade names, and brands \| Previously Reported \| Omega
Intangible assets:
Definite-lived intangibles				282.0
Trademarks, trade names, and brands \| Measurement Period Adjustments \| Omega
Intangible assets:
Definite-lived intangibles			5.5
Trademarks, trade names, and brands \| Omega
Intangible assets:
Indefinite-lived intangibles					$ 2,003.8
Trademarks, trade names, and brands \| Previously Reported \| Omega
Intangible assets:
Indefinite-lived intangibles				$ 2,145.2
Trademarks, trade names, and brands \| Measurement Period Adjustments \| Omega
Intangible assets:
Indefinite-lived intangibles			$ (141.4)