Capitalized Contract Costs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Capitalized Contract Cost [Line Items]
Costs to fulfill a contract - amortization expense	$ 6.4	$ 6.2
Costs to fulfill contract, net	71.5		$ 75.8
Deferred Commissions
Capitalized Contract Cost [Line Items]
Deferred commissions	9.6		$ 9.1
Costs to fulfill a contract - amortization expense	$ 0.7	$ 0.8