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Goodwill and Identifiable Intangible Assets - Gross Carrying Value and Accumulated Amortization by Class of Identifiable Intangible Assets (Detail) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Intangible Assets [Line Items]    
Gross Carrying Amounts, Indefinite-lived tradenames $ 597.5 $ 635.6
Net Book Value, Indefinite-lived tradenames 597.5 635.6
Gross Carrying Amounts, Finite Lived 908.9 897.9
Accumulated Amortization, Finite Lived (395.2) (364.6)
Net Book Value, Finite Lived 513.7 533.3
Gross Carrying Amounts, Total identifiable intangibles 1,506.4 1,533.5
Accumulated Amortization, Total identifiable intangibles (395.2) (364.6)
Net Book Value, Total identifiable intangibles 1,111.2 1,168.9
Tradenames [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amounts, Finite Lived 33.5 20.6
Accumulated Amortization, Finite Lived (13.4) (12.9)
Net Book Value, Finite Lived 20.1 7.7
Customer and contractual relationships [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amounts, Finite Lived 799.9 803.9
Accumulated Amortization, Finite Lived (325.6) (299.6)
Net Book Value, Finite Lived 474.3 504.3
Patents/proprietary technology [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amounts, Finite Lived 75.5 73.4
Accumulated Amortization, Finite Lived (56.2) (52.1)
Net Book Value, Finite Lived $ 19.3 $ 21.3