Deferred Commissions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Capitalized Contract Cost [Line Items]
Deferred commissions	$ 29.8	$ 21.9
Deferred commissions amortization	$ 17.8	$ 15.6	$ 11.2
Minimum
Capitalized Contract Cost [Line Items]
Sales commissions amortization period	3 years
Maximum
Capitalized Contract Cost [Line Items]
Sales commissions amortization period	7 years