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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, 2019
Dec. 31, 2018
Intangible Assets [Line Items]    
Gross Carrying Amounts, Indefinite-lived tradenames $ 645.1 $ 673.9
Net Book Value, Indefinite-lived tradenames 645.1 673.9
Gross Carrying Amounts, Finite Lived 894.2 893.6
Accumulated Amortization, Finite Lived (353.2) (320.7)
Net Book Value, Finite Lived 541.0 572.9
Gross Carrying Amounts, Total identifiable intangibles 1,539.3 1,567.5
Accumulated Amortization, Total identifiable intangibles (353.2) (320.7)
Net Book Value, Total identifiable intangibles 1,186.1 1,246.8
Tradenames [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amounts, Finite Lived 20.3 19.8
Accumulated Amortization, Finite Lived (12.6) (11.9)
Net Book Value, Finite Lived 7.7 7.9
Customer and contractual relationships [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amounts, Finite Lived 800.6 800.3
Accumulated Amortization, Finite Lived (289.4) (260.2)
Net Book Value, Finite Lived 511.2 540.1
Patents/proprietary technology [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amounts, Finite Lived 73.3 73.5
Accumulated Amortization, Finite Lived (51.2) (48.6)
Net Book Value, Finite Lived $ 22.1 $ 24.9