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Intangible Contract Assets and Liabilities - Textuals (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Finite-Lived Intangible Liabilities, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |
Asset impairment charges | $ 1,418,100,000 | $ 0 | $ 1,418,100,000 | $ 0 |  |  |  |  |  |
Contract-Based Intangible Assets [Member] |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Liabilities, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |
Asset impairment charges | 4,500,000 |  | 4,500,000 |  |  |  |  |  |  |
Coal supply agreements |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |
Presented periods amortization | 1,300,000 | 6,800,000 | 3,700,000 | 11,600,000 |  |  |  |  |  |
Take-or-pay contracts |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Liabilities, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |
Presented periods amortization | $ 2,700,000 | $ 5,600,000 | $ 5,300,000 | $ 11,200,000 |  |  |  |  |  |
Scenario, Forecast | Coal supply agreements |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |
Remainder of 2020 |  |  |  |  |  |  |  |  |  | $ 1,000,000
2021 |  |  |  |  |  |  |  |  | $ 1,000,000 |
2022 |  |  |  |  |  |  |  | $ (2,000,000) |  |
2023 |  |  |  |  |  |  | $ 2,000,000.0 |  |  |
2024 |  |  |  |  |  | $ 2,000,000.0 |  |  |  |
2025 and thereafter |  |  |  |  | $ 3,000,000 |  |  |  |  |
Scenario, Forecast | Take-or-pay contracts |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Liabilities, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |
Remainder of 2020 |  |  |  |  |  |  |  |  |  | $ 3,000,000
2021 |  |  |  |  |  |  |  |  | $ 4,000,000 |
2022 |  |  |  |  |  |  |  | $ 3,000,000 |  |
2023 |  |  |  |  |  |  | $ 3,000,000 |  |  |
2024 |  |  |  |  |  | $ 3,000,000 |  |  |  |
2025 and thereafter |  |  |  |  | $ 18,000,000 |  |  |  |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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