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Goodwill and Identifiable Intangible Assets, Net - Summary of Identifiable Intangible Assets with Definite and Indefinite Useful Lives (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value $ 200.1 $ 172.0
Accumulated Amortization (107.3) (97.3)
Net 92.8 74.7
Indefinite-lived intangible assets    
Total identifiable intangible assets, Gross Carrying Value 209.0 180.9
Total identifiable intangible assets, Net 101.7 83.6
Trademarks and tradenames with indefinite lives    
Indefinite-lived intangible assets    
Trademarks and tradenames with indefinite lives, Gross Carrying Value 8.9 8.9
Trademarks and tradenames with indefinite lives, Net 8.9 8.9
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 72.4 59.7
Accumulated Amortization (22.3) (19.7)
Net 50.1 40.0
Trademarks and tradenames    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 15.1 11.6
Accumulated Amortization (1.6) (0.5)
Net 13.5 11.1
Capitalized software    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 62.2 50.6
Accumulated Amortization (49.8) (40.0)
Net 12.4 10.6
Technology    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 37.2 39.2
Accumulated Amortization (23.5) (27.5)
Net 13.7 11.7
Contracts    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 13.2 10.9
Accumulated Amortization (10.1) (9.6)
Net $ 3.1 $ 1.3