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Intangible Contract Assets and Liabilities - Balances and Balance Sheet Classifications (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Fresh-Start Adjustment [Line Items]          
Assets $ 10.1   $ 10.1   $ 20.7
Liabilities (52.7)   (52.7)   (61.4)
Finite-Lived Liabilities, Net (42.6)   (42.6)   (40.7)
Investments and other assets          
Fresh-Start Adjustment [Line Items]          
Assets 10.1   10.1   20.7
Liabilities 0.0   0.0   0.0
Finite-Lived Assets, Net (10.1)   (10.1)   (20.7)
Accounts payable and accrued expenses          
Fresh-Start Adjustment [Line Items]          
Assets 0.0   0.0   0.0
Liabilities (4.7)   (4.7)   (8.4)
Finite-Lived Liabilities, Net (4.7)   (4.7)   (8.4)
Other noncurrent liabilities          
Fresh-Start Adjustment [Line Items]          
Assets 0.0   0.0   0.0
Liabilities (48.0)   (48.0)   (53.0)
Finite-Lived Liabilities, Net (48.0)   (48.0)   (53.0)
Coal supply agreements          
Fresh-Start Adjustment [Line Items]          
Liabilities (19.0)   (19.0)   (21.4)
Take-or-pay contracts          
Fresh-Start Adjustment [Line Items]          
Liabilities (33.7)   (33.7)   (40.0)
Finite-Lived Liabilities, Net (33.7)   (33.7)   (40.0)
Coal supply agreements          
Fresh-Start Adjustment [Line Items]          
Assets 10.1   10.1   20.7
Finite-Lived Assets, Net (8.9)   (8.9)   (0.7)
Presented periods amortization 1.3 $ 6.8 3.7 $ 11.6  
Take-or-pay contracts          
Fresh-Start Adjustment [Line Items]          
Assets $ 0.0   $ 0.0   $ 0.0