Discontinued Operations - Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total Assets of Discontinued Operations	$ 0.0	$ 291.1
Total Liabilities of Discontinued Operations	0.0	69.5
ASC [Member] | Discontinued Operations, Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Rent and other receivables	0.0	21.2
Operating assets and facilities, net	0.0	249.9
Other	0.0	20.0
Total Assets of Discontinued Operations	0.0	291.1
Accounts payable and accrued expenses	0.0	29.7
Deferred income taxes	0.0	35.8
Other	0.0	4.0
Total Liabilities of Discontinued Operations	$ 0.0	$ 69.5