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Pension and Non-pension Post-employment Benefit Plans - Surplus (Deficit) in Defined Benefit Pension and Other Benefit Plans (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of net defined benefit liability (asset) [line items] |  |
Plan assets, end of year | $ 380.1 | $ 330.3
Plan assets, at fair value | 380.1 | 330.3
Pension Plan |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Accrued benefit obligations, end of year | (396.9) | (346.0)
Plan assets, end of year | 378.1 | 328.5
Excess (deficiency) of plan assets over accrued benefit obligations | (18.8) | (17.5)
Defined benefit obligation, at present value | 396.9 | 346.0
Plan assets, at fair value | 378.1 | 328.5
Surplus (deficit) in plan | (18.8) | (17.5)
Other benefit plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Accrued benefit obligations, end of year | (95.6) | (87.4)
Plan assets, end of year | 2.0 | 1.8
Excess (deficiency) of plan assets over accrued benefit obligations | (93.6) | (85.6)
Defined benefit obligation, at present value | 95.6 | 87.4
Plan assets, at fair value | 2.0 | 1.8
Surplus (deficit) in plan | $ (93.6) | $ (85.6)

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- Definition The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_57_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_57_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The fair value of any plan assets, less the present value of the defined benefit obligation. [Refer: Plan assets [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_57_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Details
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- Details
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