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Goodwill and Intangible Assets - Schedule of Other Intangible Asset Net (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 566.2 $ 542.6
Accumulated Amortization (371.2) (364.7)
Net 195.0 177.9
Trade Name [Member]    
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]    
Gross Carrying Amount 177.7 174.0
Accumulated Amortization (2.5) (2.1)
Net $ 175.2 $ 171.9
Minimum [Member] | Trade Name [Member]    
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]    
Estimated Life Range (Years) 3 years 3 years
Maximum [Member] | Trade Name [Member]    
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]    
Estimated Life Range (Years) 5 years  
Estimated Life Range (Years) Indefinite Indefinite
Customer Lists and Relationships [Member]    
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 229.0 $ 212.5
Accumulated Amortization (212.1) (208.2)
Net $ 16.9 $ 4.3
Customer Lists and Relationships [Member] | Minimum [Member]    
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]    
Estimated Life Range (Years) 5 years 5 years
Customer Lists and Relationships [Member] | Maximum [Member]    
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]    
Estimated Life Range (Years) 15 years 15 years
Technology [Member]    
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 159.5 $ 156.1
Accumulated Amortization (156.6) (154.4)
Net $ 2.9 $ 1.7
Technology [Member] | Minimum [Member]    
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]    
Estimated Life Range (Years) 3 years 3 years
Technology [Member] | Maximum [Member]    
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]    
Estimated Life Range (Years) 4 years 4 years