Goodwill and Identifiable Intangible Assets - Schedule of Goodwill (Details) $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 1,498.0
Purchase accounting adjustments and divestitures	(0.5)
Foreign currency translation	(13.5)
Goodwill, ending balance	1,484.0
Performance Coatings
Goodwill [Roll Forward]
Goodwill, beginning balance	1,422.5
Purchase accounting adjustments and divestitures	(0.4)
Foreign currency translation	(12.5)
Goodwill, ending balance	1,409.6
Mobility Coatings
Goodwill [Roll Forward]
Goodwill, beginning balance	75.5
Purchase accounting adjustments and divestitures	(0.1)
Foreign currency translation	(1.0)
Goodwill, ending balance	$ 74.4