Other Assets and Other Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Components of Other Assets reported on the consolidated balance sheets
Inventory	$ 57.2	$ 51.3
Office furniture, fixtures and other equipment, net of accumulated depreciation	20.5	27.9
Derivatives	1.2	16.4
Deferred financing costs	3.8	4.5
Assets for Plan Benefits, Defined Benefit Plan	6.2	1.1
Assets Held-for-sale, Long Lived, Fair Value Disclosure	4.5	89.5
Prepaid items	16.9	15.1
Loans Receivables Gross Carrying Amount	0.0	6.2
Assets held for sale	0.5	0.5
Other	80.1	84.6
Total	$ 190.9	$ 297.1