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Pension and Non-pension Post-employment Benefit Plans - Actuarial Gains and Losses, Net of Tax, Recognized in OCI (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of analysis of other comprehensive income by item [line items] |  |  |
Actuarial losses (gains) recognized during the year | $ 7.6 | $ (33.5) | $ (9.3)
Income tax recovery | 6.6 | 6.5 | 1.5
Actuarial assumptions |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |
Income tax recovery | 0.1 | 5.0 | 0.0
Pension and non-pension post-employment benefit plans |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |
Cumulative losses, beginning of year | 44.2 | 77.7 | 87.0
Cumulative losses, end of year | $ 51.8 | $ 44.2 | $ 77.7

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- Definition Income Tax Relating To Remeasurements Of Defined Benefit Plans, Accumulated Other Comprehensive Income + References No definition available. + Details
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- Definition The amount of other comprehensive income, net of tax, related to gains (losses) on remeasurements of defined benefit plans, which comprise actuarial gains and losses; the return on plan assets, excluding amounts included in net interest on the net defined benefit liability (asset); and any change in the effect of the asset ceiling, excluding amounts included in net interest on the net defined benefit liability (asset). [Refer: Other comprehensive income; Defined benefit plans [member]; Plan assets [member]; Net defined benefit liability (asset)] [Contrast: Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 135 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_135_b&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 91 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_91_a&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 7 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_7&doctype=Standard -URIDate 2023-03-23 + Details
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