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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
Mar. 31, 2018
Dec. 31, 2017
Intangible Assets [Line Items]    
Gross Carrying Amounts, Total identifiable intangibles $ 1,446.3 $ 1,449.6
Accumulated Amortization, Total identifiable intangibles (295.1) (287.2)
Net Book Value, Total identifiable intangibles 1,151.2 1,162.4
Gross Carrying Amounts, Indefinite-lived tradenames 709.2 709.9
Net Book Value, Indefinite-lived tradenames 709.2 709.9
Gross Carrying Amounts, Finite Lived 737.1 739.7
Accumulated Amortization, Finite Lived (295.1) (287.2)
Net Book Value, Finite Lived 442.0 452.5
Tradenames [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amounts, Finite Lived 15.7 15.7
Accumulated Amortization, Finite Lived (10.4) (9.9)
Net Book Value, Finite Lived 5.3 5.8
Customer and contractual relationships [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amounts, Finite Lived 661.1 663.8
Accumulated Amortization, Finite Lived (238.8) (232.0)
Net Book Value, Finite Lived 422.3 431.8
Patents/proprietary technology [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amounts, Finite Lived 60.3 60.2
Accumulated Amortization, Finite Lived (45.9) (45.3)
Net Book Value, Finite Lived $ 14.4 $ 14.9