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Summary of Significant Accounting Policies - Summary of Intangible Assets (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value $ 568.2 $ 373.5
Accumulated Amortization (124.1) (86.4)
Net Carrying Value $ 444.1 $ 287.1
Weighted Average Useful Life (years) 11 years 6 months 7 years 6 months
Technology    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value $ 22.2 $ 24.6
Accumulated Amortization (9.3) (16.4)
Net Carrying Value $ 12.9 $ 8.2
Weighted Average Useful Life (years) 8 years 7 months 6 days 8 years 7 months 6 days
Customer-based    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value $ 544.6 $ 338.2
Accumulated Amortization (113.9) (68.3)
Net Carrying Value $ 430.7 $ 269.9
Weighted Average Useful Life (years) 11 years 7 months 6 days 7 years 4 months 24 days
Other    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value $ 1.4 $ 10.7
Accumulated Amortization (0.9) (1.7)
Net Carrying Value $ 0.5 $ 9.0
Weighted Average Useful Life (years) 5 years 2 months 12 days 5 years 9 months 18 days