Revenue, Deferred Revenue, Contract Balances and Performance Obligations - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Deferred revenue	$ 14.3		$ 10.7
Contract with customer, asset, net	2.7		$ 0.4
Contract with customer liability, revenue recognized	6.5	$ 11.2
Contract with customer, liability, cumulative catch-up adjustment to revenue, change in estimate of transaction price	$ 1.7	$ 1.4