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Intangible Contract Assets and Liabilities - Balances and Balance Sheet Classifications (Details) - Successor - Fresh Start Reporting - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Fresh-Start Adjustment [Line Items] |  |
Assets | $ 88.5 | $ 177.2
Liabilities | 96.0 | 133.4
Net Total | (7.5) | (43.8)
Take-or-pay contracts |  |
Fresh-Start Adjustment [Line Items] |  |
Assets | 0.0 | 0.0
Coal supply agreements |  |
Fresh-Start Adjustment [Line Items] |  |
Assets | 88.5 | 177.2
Net Total | (56.1) | (134.5)
Take-or-pay contracts |  |
Fresh-Start Adjustment [Line Items] |  |
Liabilities | 63.6 | 90.7
Coal supply agreements |  |
Fresh-Start Adjustment [Line Items] |  |
Liabilities | (32.4) | (42.7)
Investments and other assets |  |
Fresh-Start Adjustment [Line Items] |  |
Assets | 88.5 | 177.2
Liabilities | 0.0 | 0.0
Net Total | (88.5) | (177.2)
Accounts payable and accrued expenses |  |
Fresh-Start Adjustment [Line Items] |  |
Assets | 0.0 | 0.0
Liabilities | 19.5 | 27.6
Other noncurrent liabilities |  |
Fresh-Start Adjustment [Line Items] |  |
Assets | 0.0 | 0.0
Liabilities | $ 76.5 | $ 105.8

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