Leases - Lease Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Lease Cost
Operating Lease, Cost	$ 15.7	$ 21.3
Variable Lease, Cost	3.2	0.3
Short-Term Lease Cost	0.3	3.8
Total Lease Expense	19.2	25.4
Less: Sublease Income	0.0	0.1
Lease, Cost	$ 19.2	$ 25.3