Acquisitions - Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Sep. 30, 2021	Sep. 15, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Goodwill from acquisition	$ 1,619.8		$ 1,294.9
U-POL
Business Acquisition [Line Items]
Cash		$ 23.7
Accounts and notes receivable, net		22.5
Inventories		23.3
Prepaid expenses and other current assets, net		3.2
Property, plant and equipment, net		16.5
Identifiable intangible assets		273.0
Other assets		2.0
Accounts payable		(20.9)
Other accrued liabilities		(3.9)
Other liabilities		(0.9)
Deferred income taxes		(68.4)
Net assets before goodwill from acquisition		270.1
Goodwill from acquisition		349.7
Net assets acquired		$ 619.8