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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Abstract] |
Accumulated Other Comprehensive Loss, Net of Related Tax | Accumulated other comprehensive income (loss) at December 31 comprised of the following components:
|  | December 31, |
(millions of dollars) |  | 2021 |  |  | 2020 |
Cumulative foreign currency translation |  | $ | (269.8 | ) |  | $ | (190.8 | )
Unrecognized pension costs (net of tax benefit of $21.4 in 2021 and $64.6 in 2020) |  |  | (69.6 | ) |  |  | (114.9 | )
Unrealized gain (loss) on cash flow hedges (net of tax expense (benefit) of $3.0 in 2021 and $(3.1) in 2020) |  |  | 5.8 |  |  |  | (2.6 | )
|  | $ | (333.6 | ) |  | $ | (308.3 | )
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, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
(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 |  | $ | (78.9 | ) |  | $ | — |  |  | $ | (78.9 | ) |  | $ | 10.9 |  |  | $ | — |  |  | $ | 10.9 |  |  | $ | (29.9 | ) |  | $ | — |  |  | $ | (29.9 | )
Pension plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial gains (losses) and prior service costs arising during the period |  |  | 49.3 |  |  |  | (12.5 | ) |  |  | 36.8 |  |  |  | (37.9 | ) |  |  | 9.2 |  |  |  | (28.7 | ) |  |  | (30.6 | ) |  |  | 7.4 |  |  |  | (23.2 | )
Amortization of net actuarial (gains) losses and prior service costs |  |  | 11.3 |  |  |  | (2.9 | ) |  |  | 8.4 |  |  |  | 13.4 |  |  |  | (3.4 | ) |  |  | 10.0 |  |  |  | 9.4 |  |  |  | (2.3 | ) |  |  | 7.1 |
Unrealized gains (losses) on cash flow hedges |  |  | 11.4 |  |  |  | (3.0 | ) |  |  | 8.4 |  |  |  | (11.6 | ) |  |  | 3.1 |  |  |  | (8.5 | ) |  |  | 0.3 |  |  |  | (0.1 | ) |  |  | 0.2 |
Total other comprehensive income (loss) |  | $ | (6.9 | ) |  | $ | (18.4 | ) |  | $ | (25.3 | ) |  | $ | (25.2 | ) |  | $ | 8.9 |  |  | $ | (16.3 | ) |  | $ | (50.8 | ) |  | $ | 5.0 |  |  | $ | (45.8 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e526-108580 + Details
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