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Intangible Contract Assets and Liabilities - Textual (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Coal Supply Agreements |  |  |
Asset impairment | $ 1,487,400,000 | $ 270,200,000 | $ 0
Take-or-pay contracts |  |  |
Coal Supply Agreements |  |  |
Presented periods amortization | 8,200,000 | 16,600,000 | 26,600,000
Take-or-Pay Contracts |  |  |
Presented periods amortization | 8,200,000 | 16,600,000 | 26,600,000
2021 | 4,000,000 |  |
2022 | 3,000,000 |  |
2023 | 3,000,000 |  |
2024 | 4,000,000 |  |
2025 | 1,000,000 |  |
Total thereafter | 20,000,000 |  |
Coal supply agreements |  |  |
Coal Supply Agreements |  |  |
Presented periods amortization | 4,200,000 | 23,200,000 | 93,000,000.0
Asset impairment | 4,500,000 |  |
2021 | 1,000,000 |  |
2022 | 2,000,000 |  |
2023 | 2,000,000 |  |
2024 | 2,000,000 |  |
2025 | 3,000,000 |  |
Take-or-Pay Contracts |  |  |
Presented periods amortization | $ 4,200,000 | $ 23,200,000 | $ 93,000,000.0

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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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