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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Abstract] |
Accumulated Other Comprehensive Income (Loss) | Accumulated other comprehensive income (loss) at December 31 comprised of the following components:
|  | December 31, |
(millions of dollars) |  | 2024 |  |  | 2023 |
Cumulative foreign currency translation |  | $ | (399.6 | ) |  | $ | (350.9 | )
Unrecognized pension benefit (costs) (net of tax (expense) benefit of $(1.2) in 2024 and $8.9 in 2023) |  |  | 1.9 |  |  |  | (28.8 | )
Unrealized gain on cash flow hedges (net of tax expense (benefit) of $0.1 in 2024 and $(1.2) in 2023) |  |  | 10.6 |  |  |  | 10.3 |
|  | $ | (387.1 | ) |  | $ | (369.4 | )
Changes in Other Comprehensive Income (Loss) by Component | The following table summarizes the changes in other comprehensive income (loss) by component:
|  | Year Ended December 31, |
|  | 2024 |  |  | 2023 |  |  | 2022 |
(millions of dollars) |  | Pre-Tax Amount |  |  | Tax (Expense) Benefit |  |  | Net-of- Tax Amount |  |  | Pre-Tax Amount |  |  | Tax (Expense) Benefit |  |  | Net-of- Tax Amount |  |  | Pre-Tax Amount |  |  | Tax (Expense) Benefit |  |  | Net-of- Tax Amount |
Foreign currency translation adjustment |  | $ | (49.9 | ) |  | $ | — |  |  | $ | (49.9 | ) |  | $ | (6.1 | ) |  | $ | — |  |  | $ | (6.1 | ) |  | $ | (78.9 | ) |  | $ | — |  |  | $ | (78.9 | )
Pension plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial gains (losses) and prior service costs arising during the period |  |  | 39.5 |  |  |  | (9.7 | ) |  |  | 29.8 |  |  |  | 5.1 |  |  |  | (1.4 | ) |  |  | 3.7 |  |  |  | 41.4 |  |  |  | (9.8 | ) |  |  | 31.6 |
Amortization of net actuarial (gains) losses and prior service costs |  |  | 1.1 |  |  |  | (0.3 | ) |  |  | 0.8 |  |  |  | 2.5 |  |  |  | (0.6 | ) |  |  | 1.9 |  |  |  | 4.9 |  |  |  | (1.2 | ) |  |  | 3.7 |
Unrealized gains (losses) on cash flow hedges |  |  | 0.4 |  |  |  | (0.1 | ) |  |  | 0.3 |  |  |  | (4.5 | ) |  |  | 1.2 |  |  |  | (3.3 | ) |  |  | 10.6 |  |  |  | (2.8 | ) |  |  | 7.8 |
Total other comprehensive income (loss) |  | $ | (8.9 | ) |  | $ | (10.1 | ) |  | $ | (19.0 | ) |  | $ | (3.0 | ) |  | $ | (0.8 | ) |  | $ | (3.8 | ) |  | $ | (22.0 | ) |  | $ | (13.8 | ) |  | $ | (35.8 | )

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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 1 -Section 45 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-1 + Details
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