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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2024
Equity [Abstract] |
Change in Accumulated Other Comprehensive Loss | The following tables summarize the changes in each component of Accumulated other comprehensive loss, net of tax:
(in millions of dollars) | Actuarial Losses |  | Prior Service Costs |  | Foreign Currency Translation |  | Interest Rate Swaps |  | Total
Balance at January 1, 2024 (a) | $ | (69.7) |  |  | $ | (2.0) |  |  | $ | (10.1) |  |  | $ | 0.5 |  |  | $ | (81.3) |
Other comprehensive income (loss) before reclassifications | 2.2 |  |  | 0.1 |  |  | (14.4) |  |  | 1.1 |  |  | (11.0) |
Amounts reclassified from accumulated other comprehensive loss | 5.0 |  |  | 0.1 |  |  | — |  |  | (1.8) |  |  | 3.3 |
Net current-period other comprehensive income (loss) | 7.2 |  |  | 0.2 |  |  | (14.4) |  |  | (0.7) |  |  | (7.7) |
Balance at December 31, 2024 (a) | $ | (62.5) |  |  | $ | (1.8) |  |  | $ | (24.5) |  |  | $ | (0.2) |  |  | $ | (89.0) |
(a) Amounts in parentheses indicate losses.
(in millions of dollars) (a) | Actuarial Losses |  | Prior Service Costs |  | Foreign Currency Translation |  | Interest Rate Swaps |  | Total
Balance at January 1, 2023 (a) | $ | (68.6) |  |  | $ | (2.0) |  |  | $ | (16.0) |  |  | $ | 2.6 |  |  | $ | (84.0) |
Other comprehensive (loss) income before reclassifications | (2.8) |  |  | (0.1) |  |  | 5.9 |  |  | 0.3 |  |  | 3.3 |
Amounts reclassified from accumulated other comprehensive loss | 1.7 |  |  | 0.1 |  |  | — |  |  | (2.4) |  |  | (0.6) |
Net current-period other comprehensive (loss) income | (1.1) |  |  | — |  |  | 5.9 |  |  | (2.1) |  |  | 2.7 |
Balance at December 31, 2023 (a) | $ | (69.7) |  |  | $ | (2.0) |  |  | $ | (10.1) |  |  | $ | 0.5 |  |  | $ | (81.3) |
(a) Amounts in parentheses indicate losses.
Reclassifications from Accumulated Other Comprehensive Loss | The following table summarizes the amounts reclassified from Accumulated other comprehensive loss, net of tax, and the affected line item in the Consolidated Statements of Operations:
Details about Accumulated Other Comprehensive Loss Components |  | Amount Reclassified from Accumulated Other Comprehensive Loss |  | Affected Line Item in Consolidated Statements of Operations
| For the Years Ended December 31, |
| 2024 |  | 2023 |
|  | (in millions of dollars) (a) |  |
Amortization of actuarial losses of defined benefit pension plans |  | $ | (3.0) |  |  | $ | (2.3) |  |  | Other expense (income), net
Amortization of prior service costs of defined benefit pension plans |  | (0.1) |  |  | (0.1) |  |  | Other expense (income), net
Recognition of actuarial losses associated with pension settlement |  | (3.8) |  |  | — |  |  | Pension settlement charges
Interest rate swaps |  | 2.4 |  |  | 3.2 |  |  | Interest expense, net
Total before tax |  | (4.5) |  |  | 0.8 |  |  |
Income tax benefit (expense) |  | 1.2 |  |  | (0.2) |  |  | Income tax expense
Total reclassifications for the period, net of tax |  | $ | (3.3) |  |  | $ | 0.6 |  |  |
(a) Amount in parentheses indicate expenses on the Consolidated Statements of Operations.

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