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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, 2018
Dec. 31, 2017
Intangible Assets [Line Items]    
Gross Carrying Amounts, Total identifiable intangibles $ 1,567.5 $ 1,449.6
Gross Carrying Amounts, Finite Lived 893.6 739.7
Accumulated Amortization, Finite Lived (320.7) (287.2)
Net Book Value, Finite Lived 572.9 452.5
Gross Carrying Amounts, Indefinite-lived tradenames 673.9 709.9
Net Book Value, Indefinite-lived tradenames 673.9 709.9
Accumulated Amortization, Total identifiable intangibles (320.7) (287.2)
Net Book Value, Total identifiable intangibles 1,246.8 1,162.4
Tradenames [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amounts, Finite Lived 19.8 15.7
Accumulated Amortization, Finite Lived (11.9) (9.9)
Net Book Value, Finite Lived 7.9 5.8
Customer and contractual relationships [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amounts, Finite Lived 800.3 663.8
Accumulated Amortization, Finite Lived (260.2) (232.0)
Net Book Value, Finite Lived 540.1 431.8
Patents/proprietary technology [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amounts, Finite Lived 73.5 60.2
Accumulated Amortization, Finite Lived (48.6) (45.3)
Net Book Value, Finite Lived $ 24.9 $ 14.9