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Goodwill and Intangible Assets - Schedule of Other Intangible Asset (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 684.9 $ 566.2
Accumulated Amortization (373.7) (371.2)
Net 311.2 195.0
Trade Name [Member]    
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]    
Gross Carrying Amount 184.8 177.7
Accumulated Amortization (2.7) (2.5)
Net $ 182.1 $ 175.2
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 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 $ 296.0 $ 229.0
Accumulated Amortization (213.4) (212.1)
Net $ 82.6 $ 16.9
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 $ 204.1 $ 159.5
Accumulated Amortization (157.6) (156.6)
Net $ 46.5 $ 2.9
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