Other Assets and Other Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Components of Other Assets reported on the consolidated balance sheets
Inventory	$ 52.0	$ 64.3
Prepaid Supplies	42.0	18.9
Office furniture, fixtures and other equipment, net of accumulated depreciation	30.2	32.2
Assets for Plan Benefits, Defined Benefit Plan	28.6	16.0
Deferred Finance Costs, Own-share Lending Arrangement, Issuance Costs, Net	2.8	3.0
Assets Held-for-sale, Long Lived, Fair Value Disclosure	3.8	4.8
Derivative asset	8.9	6.4
Other	96.7	84.7
Total	$ 265.0	$ 230.3