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Software and Other Intangible Assets - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Other intangible assets amortization expense $ 9.3 $ 9.3
Software for resale    
Finite-Lived Intangible Assets [Line Items]    
Software, amortization expense 2.0 1.9
Software for internal use    
Finite-Lived Intangible Assets [Line Items]    
Software, amortization expense $ 16.9 $ 16.7
Minimum | Software for resale    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible asset, useful life (in years) 5 years  
Minimum | Software for internal use    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible asset, useful life (in years) 3 years  
Maximum | Software for resale    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible asset, useful life (in years) 10 years  
Maximum | Software for internal use    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible asset, useful life (in years) 8 years