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Stockholder's Equity - Accumulated Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2025
Equity [Abstract] |
Changes in Accumulated Other Comprehensive Loss |
|  | Defined Benefit |  | Commodity |  | Interest Rate |  |
|  | Pension and |  | Contract |  | Swap |  |
|  | Postretirement |  | Cash Flow |  | Cash Flow |  |
|  | Plan Items |  | Hedges |  | Hedges |  | Total
(in millions) |  |  |  |  |  |  |  |
As of December 31, 2024 |  | $ | (2.1) |  |  | $ | 0.4 |  |  | $ | — |  |  | $ | (1.7) |
Other comprehensive loss before reclassifications |  | — |  |  | — |  |  | (0.8) |  |  | (0.8) |
Amounts reclassified from accumulated other comprehensive loss |  | — |  |  | (0.5) |  |  | (0.2) |  |  | (0.7) |
Net current-period other comprehensive loss |  | — |  |  | (0.5) |  |  | (1.0) |  |  | (1.5) |
As of September 30, 2025 |  | $ | (2.1) |  |  | $ | (0.1) |  |  | $ | (1.0) |  |  | $ | (3.2) |
As of December 31, 2023 |  | $ | (2.6) |  |  | $ | (0.3) |  |  | $ | 0.1 |  |  | $ | (2.8) |
Other comprehensive income (loss) before reclassifications |  | — |  |  | 1.0 |  |  | (1.3) |  |  | (0.3) |
Amounts reclassified from accumulated other comprehensive loss |  | — |  |  | (0.6) |  |  | (0.4) |  |  | (1.0) |
Net prior-period other comprehensive income (loss) |  | — |  |  | 0.4 |  |  | (1.7) |  |  | (1.3) |
As of September 30, 2024 |  | $ | (2.6) |  |  | $ | 0.1 |  |  | $ | (1.6) |  |  | $ | (4.1) |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481674/830-30-50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481694/830-30-45-20 + Details
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