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Valuation and Qualifying Accounts Schedule II (Tables) | 12 Months Ended
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Dec. 31, 2024
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Summary of Valuation Allowance | SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS
Description |  | Balance at Beginning of Period |  | Charged to Costs and Expenses |  |  |  | Deductions(1) |  | Other(2) |  | Balance at End of Period
|  | (Dollars in millions)
Year Ended December 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |
Reserves deducted from asset accounts: |  |  |  |  |  |  |  |  |  |  |  |
Reserve for materials and supplies |  | $ | 7.2 |  |  | $ | 1.7 |  |  |  |  | $ | (5.4) |  |  | $ | — |  |  | $ | 3.5 |
Tax valuation allowances |  | 1,473.5 |  |  | (9.6) |  |  |  |  | — |  |  | (43.0) |  |  | 1,420.9 |
Year Ended December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |
Reserves deducted from asset accounts: |  |  |  |  |  |  |  |  |  |  |  |
Reserve for materials and supplies |  | $ | 9.5 |  |  | $ | 2.6 |  |  |  |  | $ | (4.9) |  |  | $ | — |  |  | $ | 7.2 |
Tax valuation allowances |  | 1,451.0 |  |  | 0.6 |  |  |  |  | — |  |  | 21.9 |  |  | 1,473.5 |
Year Ended December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |
Reserves deducted from asset accounts: |  |  |  |  |  |  |  |  |  |  |  |
Advance royalty recoupment reserve |  | $ | 0.3 |  |  | $ | (0.3) |  |  |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Reserve for materials and supplies |  | 9.0 |  |  | 1.4 |  |  |  |  | (0.9) |  |  | — |  |  | 9.5 |
Tax valuation allowances |  | 2,120.8 |  |  | (583.8) |  |  |  |  | — |  |  | (86.0) |  |  | 1,451.0 |
(1)Reserves utilized, unless otherwise indicated. (2)Includes the impact of changes in the Australian dollar exchange rates.

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- Definition Tabular disclosure of valuation allowances to reduce deferred tax assets to net realizable value, including identification of the deferred tax asset more likely than not will not be fully realized and the corresponding amount of the valuation allowance. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
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