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Customer Contracts - Schedule of Amortization of Capitalized Contract Costs (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Amortization of capitalized sales commissions    
Capitalized Contract Cost [Line Items]    
Capitalized contract cost, amortization $ 10.8 $ 10.9
Amortization of capitalized implementation costs    
Capitalized Contract Cost [Line Items]    
Capitalized contract cost, amortization $ 4.4 $ 4.2