Other Assets and Other Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Components of Other Assets reported on the consolidated balance sheets
Inventory	$ 64.3	$ 59.4
Office furniture, fixtures and other equipment, net of accumulated depreciation	32.2	34.4
Assets for Plan Benefits, Defined Benefit Plan	16.0	11.0
Deferred Finance Costs, Own-share Lending Arrangement, Issuance Costs, Net	3.0	2.6
Assets Held-for-sale, Long Lived, Fair Value Disclosure	4.8	3.4
Prepaid items	(18.9)	(21.5)
Derivative asset	6.4	8.5
Other	84.7	80.2
Total	$ 230.3	$ 221.0