Acquisition - Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Dec. 31, 2020	Jan. 21, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill	$ 3,430.7		$ 3,306.0	$ 3,325.5
Matricel
Business Acquisition [Line Items]
Cash		$ 2.9
Trade accounts receivable		1.0
Inventories		1.9
Prepaid expenses and other current assets		0.2
Property, plant and equipment		0.5
Goodwill		25.1
Other intangible assets		22.3
Total assets acquired		53.9
Trade accounts payable		(0.1)
Accrued expenses and other liabilities		(10.2)
Total liabilities assumed		(10.3)
Total net assets acquired		$ 43.6