Revenue from Contracts with Customers - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue recognized	$ 66.6	$ 48.5	$ 117.2	$ 84.3
Contract assets	$ 0.5		$ 0.5		$ 0.8
Cloud-Based Subscription Contract [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract term			1 year
Managed Services Offerings [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract term			1 year
Term And Perpetual License [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Economic life			5 years
Professional Services [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Amortization period	1 year		1 year
Expected timing of satisfaction, period	12 months		12 months
Professional Services [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contractual period			1 year