Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	$ 0.0	$ 0.1
Disposal Group, Including Discontinued Operation, Revenue	10.0	16.3
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net	1.8		$ 17.4
Disposal Group, Including Discontinued Operation, Other Assets, Current	0.1		0.3
Disposal Group, Including Discontinued Operation, Assets	1.9		17.7
Disposal Group, Including Discontinued Operation, Accounts Payable	3.4		3.8
Disposal Group, Including Discontinued Operation, Other Liabilities, Current	2.5		3.1
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent	6.2		6.2
Disposal Group, Including Discontinued Operation, Liabilities	12.1		$ 13.1
Disposal Group, Including Discontinued Operation, Operating and Other Expenses	(8.7)	13.5
Disposal Group, Including Discontinued Operation, Asset Retirement Obligation, Revision of Estimate		22.5
Loss from discontinued operations before income taxes	1.3	29.8
Income tax expense from discontinued operations	0.3	4.3
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	1.0	25.6
Cash Provided by (Used in) Operating Activities, Discontinued Operations	15.8	$ 8.1
Cash flows from investing activities for discontinued operations	0.0
Subsidiaries [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Long Term Indebtedness, Less than or Equal to	$ 750.0