Leases Lease cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Fixed lease cost - operating leases	$ 40.0	$ 41.6	$ 41.4
Finance Lease, Right-of-Use Asset, Amortization	0.2	0.0	0.0
Finance Lease, Interest Expense	0.3	0.0	0.0
Lease, Cost, Excluding Sublease Income	40.5	41.6	41.4
Gain (Loss) On Finance Lease, Liability	$ 8.5	$ 12.9	$ 1.0