Other Assets and Other Liabilities (Details) - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017
Components of Other Assets reported on the consolidated balance sheets
Inventory		$ 63.7	$ 57.2
Office furniture, fixtures and other equipment, net of accumulated depreciation		34.3	20.5
Assets for Plan Benefits, Defined Benefit Plan		4.4	6.2
Deferred Finance Costs, Own-share Lending Arrangement, Issuance Costs, Net		3.1	3.8
Assets Held-for-sale, Long Lived, Fair Value Disclosure		1.3	4.5
Prepaid items		10.0	16.9
Derivative Asset	[1]	4.9	1.2
Other		84.4	80.6
Total		$ 206.1	$ 190.9

[1] (2) Not designated as hedges