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Intangible Contract Assets and Liabilities - Balances and Balance Sheet Classifications (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Fresh-Start Adjustment [Line Items]
Assets	$ 16.8	$ 20.7
Liabilities	(52.8)	(61.4)
Finite-Lived Liabilities, Net	(36.0)	(40.7)
Investments and other assets
Fresh-Start Adjustment [Line Items]
Assets	16.8	20.7
Liabilities	0.0	0.0
Finite-Lived Assets, Net	(16.8)	(20.7)
Accounts payable and accrued expenses
Fresh-Start Adjustment [Line Items]
Assets	0.0	0.0
Liabilities	(5.9)	(8.4)
Finite-Lived Liabilities, Net	(5.9)	(8.4)
Other noncurrent liabilities
Fresh-Start Adjustment [Line Items]
Assets	0.0	0.0
Liabilities	(46.9)	(53.0)
Finite-Lived Liabilities, Net	(46.9)	(53.0)
Coal supply agreements
Fresh-Start Adjustment [Line Items]
Liabilities	(19.9)	(21.4)
Take-or-pay contracts
Fresh-Start Adjustment [Line Items]
Liabilities	(32.9)	(40.0)
Finite-Lived Liabilities, Net	(32.9)	(40.0)
Coal supply agreements
Fresh-Start Adjustment [Line Items]
Assets	16.8	20.7
Finite-Lived Assets, Net	(3.1)	(0.7)
Take-or-pay contracts
Fresh-Start Adjustment [Line Items]
Assets	$ 0.0	$ 0.0

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
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