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Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Advance royalty recoupment reserve |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period |  | $ 0.0 | $ 0.3
Charged to Costs and Expenses |  |  | (0.3)
Deductions |  |  | 0.0
Other(2) |  |  | 0.0
Balance at End of Period |  |  | 0.0
Reserve for materials and supplies |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | $ 7.2 | 9.5 | 9.0
Charged to Costs and Expenses | 1.7 | 2.6 | 1.4
Deductions | (5.4) | (4.9) | (0.9)
Other(2) | 0.0 | 0.0 | 0.0
Balance at End of Period | 3.5 | 7.2 | 9.5
Tax valuation allowances |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 1,473.5 | 1,451.0 | 2,120.8
Charged to Costs and Expenses | (9.6) | 0.6 | (583.8)
Deductions | 0.0 | 0.0 | 0.0
Other(2) | (43.0) | 21.9 | (86.0)
Balance at End of Period | $ 1,420.9 | $ 1,473.5 | $ 1,451.0

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- Definition Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-4 + Details
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