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Schedule of Carrying Amount of Other Intangible Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount, Amortizable intangible assets $ 239.5 $ 227.7
Gross Carrying Amount, Total intangible assets 404.7 390.8
Accumulated Amortization, Amortizable intangible assets (96.0) (82.5)
Net, Amortizable intangible assets 143.5 145.2
Net, Total intangible assets 308.7 308.3
Trade Names    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount, indefinite-lived intangible assets 165.2 163.1
Net, Indefinite-lived intangible assets 165.2 163.1
Patents    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount, Amortizable intangible assets 3.7 3.7
Accumulated Amortization, Amortizable intangible assets (2.7) (2.2)
Net, Amortizable intangible assets 1.0 1.5
Customer Lists    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount, Amortizable intangible assets 235.8 224.0
Accumulated Amortization, Amortizable intangible assets (93.3) (80.3)
Net, Amortizable intangible assets $ 142.5 $ 143.7