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Capitalized Contract Costs (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Capitalized Contract Cost [Line Items]          
Costs to fulfill a contract - amortization expense $ 6.3 $ 5.7 $ 12.7 $ 11.9  
Costs to fulfill contract, net 73.4   73.4   $ 75.8
Deferred Commissions          
Capitalized Contract Cost [Line Items]          
Deferred commissions 9.8   9.8   $ 9.1
Costs to fulfill a contract - amortization expense $ 0.8 $ 0.9 $ 1.5 $ 1.7