Leases - Lease Cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Lease Cost
Operating Lease Cost	$ 4.0	$ 5.8	$ 11.9	$ 17.2
Variable Lease, Cost	1.0	0.1	3.2	0.2
Short-Term Lease Cost	(0.3)	1.0	0.5	3.2
Total Lease Expense	4.7	6.9	15.6	20.6
Less: Sublease Income	0.0	0.0	0.0	0.1
Lease, Cost	$ 4.7	$ 6.9	$ 15.6	$ 20.5