Segment Information - Reconciliation of Segment Revenue to Consolidated (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 517.3	$ 438.8	$ 1,027.1	$ 954.2
Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	440.9	367.6	873.8	803.6
Other revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	76.9	71.2	154.7	150.7
Elimination of intercompany revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ (0.5)	$ 0.0	$ (1.4)	$ (0.1)