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Goodwill and Intangible Assets - Schedule of Other Intangible Asset (Detail) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 534.9 $ 539.8
Accumulated Amortization (338.3) (333.3)
Net 196.6 206.5
Customer Lists and Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 207.6 210.1
Accumulated Amortization (183.6) (177.0)
Net $ 24.0 $ 33.1
Customer Lists and Relationships [Member] | Minimum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated Life Range (Years) 5 years 5 years
Customer Lists and Relationships [Member] | Maximum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated Life Range (Years) 15 years 15 years
Trade Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 173.8 $ 174.1
Accumulated Amortization (2.0) (2.1)
Net 171.8 172.0
Technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 153.5 155.6
Accumulated Amortization (152.7) (154.2)
Net $ 0.8 $ 1.4
Technology [Member] | Minimum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated Life Range (Years) 2 years 2 years
Technology [Member] | Maximum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated Life Range (Years) 7 years 7 years