Acquisitions and Divestitures - Assets and Liabilities Held for Sale (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property, plant and equipment classified as held for sale		$ 11.2
Worldwide rights to Osurnia and U.S. rights to Capstar | Held for Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Inventories	$ 2.1	10.6
Other intangibles, net	3.5	61.2
Property, plant and equipment classified as held for sale	0.0	0.2
Deferred tax asset	1.0	0.0
Total assets held for sale	6.6	72.0
Deferred taxes	0.0	(1.4)
Total liabilities held for sale	$ 0.0	$ (1.4)