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Schedule of Carrying Amount of Other Intangible Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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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

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