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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	3 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of analysis of other comprehensive income by item [line items]
Loss on pension annuity purchases (see note 18(a))	$ 0.2	$ 0.0	$ 0.2	$ 0.0
Actuarial losses (gains) recognized during the year		(9.3)	9.1	8.7
Income tax expense		0.0	0.4	0.3
Income tax recovery		1.5	1.5	1.1
Pension and non-pension post-employment benefit plans
Disclosure of analysis of other comprehensive income by item [line items]
Cumulative losses, beginning of year		87.0	77.7	69.0
Cumulative losses, end of year		$ 77.7	$ 87.0	$ 77.7

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- Definition

Cumulative Gain (Loss) On Defined Benefit Plans

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Income Tax Relating To Remeasurements Of Defined Benefit Plans, Accumulated Other Comprehensive Income

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Other Comprehensive Income, Net of Tax, Gain (Loss) on Settlement

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The amount of income tax relating to amounts recognised in other comprehensive income in relation to remeasurements of defined benefit plans. [Refer: Other comprehensive income; Reserve of remeasurements of defined benefit plans; Defined benefit plans [member]]

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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]

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