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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, 2019
Dec. 31, 2018
Intangible Assets [Line Items]    
Gross Carrying Amounts, Total identifiable intangibles $ 1,571.9 $ 1,567.5
Gross Carrying Amounts, Finite Lived 896.1 893.6
Accumulated Amortization, Finite Lived (332.2) (320.7)
Net Book Value, Finite Lived 563.9 572.9
Gross Carrying Amounts, Indefinite-lived tradenames 675.8 673.9
Net Book Value, Indefinite-lived tradenames 675.8 673.9
Accumulated Amortization, Total identifiable intangibles (332.2) (320.7)
Net Book Value, Total identifiable intangibles 1,239.7 1,246.8
Tradenames [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amounts, Finite Lived 20.1 19.8
Accumulated Amortization, Finite Lived (12.2) (11.9)
Net Book Value, Finite Lived 7.9 7.9
Customer and contractual relationships [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amounts, Finite Lived 802.5 800.3
Accumulated Amortization, Finite Lived (270.5) (260.2)
Net Book Value, Finite Lived 532.0 540.1
Patents/proprietary technology [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amounts, Finite Lived 73.5 73.5
Accumulated Amortization, Finite Lived (49.5) (48.6)
Net Book Value, Finite Lived $ 24.0 $ 24.9