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Asset Impairment (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |
Asset impairment charges | $ 11.2 | $ 0.0 | $ 1,487.4
Asset impairment of property, plant and equipment and mine development assets | 9.5 | $ 0.0 | 1,487.4
Impairment to unallocated coal reserves |  |  | 69.3
Equity Securities |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |
Asset impairment charges | 1.7 |  |
Land |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |
Asset impairment charges | $ 9.5 |  |
Powder River Basin Mining |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |
Asset impairment charges |  |  | 1,418.1
Asset impairment of property, plant and equipment and mine development assets |  |  | 1,393.7
Operating lease right-of-use assets impairment |  |  | 19.9
Impairment of contract-based intangible assets |  |  | $ 4.5

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + 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=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123351718&loc=d3e2420-110228 + Details
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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value. + 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=123570139&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 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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