Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Revenue		$ 0.5		$ 1.4
Disposal Group, Including Discontinued Operation, Operating and Other Expenses		(0.7)		(2.4)
Loss from discontinued operations before income taxes	$ 0.0	(0.2)	$ 0.0	(1.0)
Income tax benefit from discontinued operations	0.0	0.0	0.0	(0.2)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	$ 0.0	(0.2)	0.0	(0.8)
Cash Provided by (Used in) Operating Activities, Discontinued Operations		0.2		0.0
Cash Provided by (Used in) Investing Activities, Discontinued Operations		(0.4)		(0.8)
Cash flows from investing activities for discontinued operations		$ (0.4)		$ (0.8)
Conesville [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payments for Removal Costs			$ 4.0