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Schedule II - Valuation Accounts and Reserves | 12 Months Ended
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Dec. 31, 2024
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Schedule II - Valuation Accounts and Reserves |
(Millions of dollars) | Balance at January 1 |  | Charged to Expense |  | Deductions |  | Other |  | Balance at December 31
2024 |  |  |  |  |  |  |  |  |
Deducted from asset accounts: |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts | $ | 1.6 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 1.6 |
Deferred tax asset valuation allowance | 146.9 |  |  | 2.6 |  |  | — |  |  | — |  |  | 149.5 |
2023 |  |  |  |  |  |  |  |  |
Deducted from asset accounts: |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts | $ | 1.6 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 1.6 |
Deferred tax asset valuation allowance | 136.0 |  |  | 10.9 |  |  | — |  |  | — |  |  | 146.9 |
2022 |  |  |  |  |  |  |  |  |
Deducted from asset accounts: |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts | $ | 1.6 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 1.6 |
Deferred tax asset valuation allowance | 111.2 |  |  | 24.8 |  |  | — |  |  | — |  |  | 136.0 |

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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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- References No definition available. + Details
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