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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
Dec. 31, 2017
Dec. 31, 2016
Intangible Assets [Line Items]    
Gross Carrying Amounts, Total identifiable intangibles $ 1,449.6 $ 1,361.4
Accumulated Amortization, Total identifiable intangibles (287.2) (254.4)
Net Book Value, Total identifiable intangibles 1,162.4 1,107.0
Gross Carrying Amounts, Indefinite-lived tradenames 709.9 671.8
Net Book Value, Indefinite-lived tradenames 709.9 671.8
Gross Carrying Amounts, Finite Lived 739.7 689.6
Accumulated Amortization, Finite Lived (287.2) (254.4)
Net Book Value, Finite Lived 452.5 435.2
Tradenames [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amounts, Finite Lived 15.7 15.8
Accumulated Amortization, Finite Lived (9.9) (7.3)
Net Book Value, Finite Lived 5.8 8.5
Customer and contractual relationships [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amounts, Finite Lived 663.8 611.9
Accumulated Amortization, Finite Lived (232.0) (203.1)
Net Book Value, Finite Lived 431.8 408.8
Patents/proprietary technology [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amounts, Finite Lived 60.2 61.9
Accumulated Amortization, Finite Lived (45.3) (44.0)
Net Book Value, Finite Lived $ 14.9 $ 17.9