Leases - Schedule of Components of Lease Costs (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021
Operating leases
Operating lease costs	$ 0.8	$ 1.4
Variable lease costs	0.0	0.2
Total operating lease costs	0.8	1.6
Finance leases
Amortization of right-of-use asset	0.1	0.3
Interest on finance lease liabilities	0.0	0.0
Total finance lease costs	$ 0.1	$ 0.3