Other Assets and Other Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Components of Other Assets reported on the consolidated balance sheets
Inventory	$ 74.0	$ 60.2
Prepaid Supplies	14.3	12.7
Deferred Finance Costs, Own-share Lending Arrangement, Issuance Costs, Gross	2.0	2.5
Assets Held-for-sale, Long Lived, Fair Value Disclosure	0.8	40.0
Prepaid pension	14.0	14.2
Office furniture, fixtures and other equipment, net of accumulated depreciation	28.5	29.5
Utilization asset	24.1	23.0
Derivative asset	0.5	0.7
Other	128.4	88.6
Total	$ 286.6	$ 271.4