Revenue from Contracts with Customers - Revenue Disaggregated by Service Offering (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Total revenue	$ 110.9	$ 68.5	$ 213.1	$ 123.1
Subscription
Disaggregation of Revenue [Line Items]
Total revenue	109.7	67.5	210.9	121.1
Usage-based
Disaggregation of Revenue [Line Items]
Total revenue	$ 1.2	$ 1.0	$ 2.2	$ 2.0