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Summary of Significant Accounting Policies - Summary of Intangible Assets (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value $ 448.0 $ 246.3
Accumulated Amortization (191.8) (153.8)
Net Carrying Value $ 256.2 $ 92.5
Weighted Average Useful Life (years) 8 years 8 months 12 days 8 years 4 months 24 days
Technology    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value $ 31.1 $ 31.4
Accumulated Amortization (19.4) (16.3)
Net Carrying Value $ 11.7 $ 15.1
Weighted Average Useful Life (years) 7 years 8 months 12 days 9 years
Customer-based    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value $ 406.0 $ 214.9
Accumulated Amortization (172.4) (137.5)
Net Carrying Value $ 233.6 $ 77.4
Weighted Average Useful Life (years) 8 years 9 months 18 days 8 years 2 months 12 days
Other    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value $ 10.9  
Accumulated Amortization 0.0  
Net Carrying Value $ 10.9  
Weighted Average Useful Life (years) 5 years 8 months 12 days