Goodwill and Other Intangible Assets - Schedule of Identifiable Intangible Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 625.5	$ 660.6
Accumulated Amortization	256.0	265.1
Total	678.5	732.0
Trademarks
Indefinite-lived Intangible Assets
Indefinite-Lived:	53.0	71.4
Customer relationships
Finite-Lived Intangible Assets
Gross Carrying Amount	455.8	470.1
Accumulated Amortization	168.2	166.2
Existing technology
Finite-Lived Intangible Assets
Gross Carrying Amount	98.8	117.5
Accumulated Amortization	38.3	50.8
Trademarks
Finite-Lived Intangible Assets
Gross Carrying Amount	37.5	39.4
Accumulated Amortization	24.7	24.1
Other
Finite-Lived Intangible Assets
Gross Carrying Amount	33.4	33.6
Accumulated Amortization	$ 24.8	$ 24.0