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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, 2021
Dec. 31, 2020
Intangible Assets [Line Items]    
Gross Carrying Amounts, Indefinite-lived tradenames $ 711.7 $ 711.0
Net Book Value, Indefinite-lived tradenames 711.7 711.0
Gross Carrying Amounts, Finite Lived 1,147.4 1,117.6
Accumulated Amortization, Finite Lived (457.8) (408.3)
Net Book Value, Finite Lived 689.6 709.3
Gross Carrying Amounts, Total identifiable intangibles 1,859.1 1,828.6
Accumulated Amortization, Total identifiable intangibles (457.8) (408.3)
Net Book Value, Total identifiable intangibles 1,401.3 1,420.3
Tradenames [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amounts, Finite Lived 37.1 34.8
Accumulated Amortization, Finite Lived (15.3) (14.0)
Net Book Value, Finite Lived 21.8 20.8
Customer and contractual relationships [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amounts, Finite Lived 977.3 973.2
Accumulated Amortization, Finite Lived (375.1) (337.3)
Net Book Value, Finite Lived 602.2 635.9
Patents/proprietary technology [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amounts, Finite Lived 133.0 109.6
Accumulated Amortization, Finite Lived (67.4) (57.0)
Net Book Value, Finite Lived $ 65.6 $ 52.6