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Capitalized Contract Costs (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Capitalized Contract Cost [Line Items]          
Costs to fulfill a contract - amortization expense $ 7.7 $ 7.9 $ 20.4 $ 20.6  
Costs to fulfill contract 61.8   61.8   $ 74.4
Deferred Commissions          
Capitalized Contract Cost [Line Items]          
Deferred commissions 6.8   6.8   $ 8.7
Costs to fulfill a contract - amortization expense $ 0.6 $ 0.8 $ 2.2 $ 2.3