Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite And Indefinite Lived Assets By Major Class [Line Items]
Definite lived assets, gross	$ 4,661.7	$ 4,417.2	$ 3,705.3
Accumulated Amortization	1,371.2	1,020.4	732.2
Indefinite-lived intangible assets, gross	90.3	114.5	1,916.3
Total other intangible assets	4,752.0	4,531.7	5,621.6
Trademarks, trade names, and brands
Finite And Indefinite Lived Assets By Major Class [Line Items]
Indefinite-lived intangible assets, gross	52.1	50.5	1,868.1
In-process research and development
Finite And Indefinite Lived Assets By Major Class [Line Items]
Indefinite-lived intangible assets, gross	38.2	64.0	48.2
Distribution and license agreements, supply agreements
Finite And Indefinite Lived Assets By Major Class [Line Items]
Definite lived assets, gross	311.2	305.6	242.4
Accumulated Amortization	169.8	120.4	77.7
Developed product technology, formulations, and product rights
Finite And Indefinite Lived Assets By Major Class [Line Items]
Definite lived assets, gross	1,358.4	1,418.1	1,387.6
Accumulated Amortization	598.7	526.0	426.0
Customer relationships and distribution networks
Finite And Indefinite Lived Assets By Major Class [Line Items]
Definite lived assets, gross	1,642.0	1,489.9	1,520.7
Accumulated Amortization	460.6	307.5	193.0
Trademarks, trade names, and brands
Finite And Indefinite Lived Assets By Major Class [Line Items]
Definite lived assets, gross	1,335.4	1,189.3	539.4
Accumulated Amortization	129.5	55.3	22.8
Non-compete agreements
Finite And Indefinite Lived Assets By Major Class [Line Items]
Definite lived assets, gross	14.7	14.3	15.2
Accumulated Amortization	$ 12.6	$ 11.2	$ 12.7