Capitalized Contract Costs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Capitalized Contract Cost [Line Items]
Costs to fulfill a contract - amortization expense	$ 5.9	$ 6.4
Costs to fulfill contract	70.5		$ 74.4
Deferred Commissions
Capitalized Contract Cost [Line Items]
Deferred commissions	7.9		$ 8.7
Costs to fulfill a contract - amortization expense	$ 0.8	$ 0.7