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Pension and Non-pension Post-employment Benefit Plans - Summary of Plan Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |
Loss on pension annuity purchases (note 19(a)) | $ 0.2 | $ 0.2 | $ 0.0 | $ 63.3
Pension Plan |  |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |
Interest income |  | (0.5) | (0.6) | 0.8
Administrative expenses paid from plan assets |  | 1.1 | 1.5 | 1.3
Pension Plan | Plan assets |  |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |
Net defined benefit liability (asset) |  | 328.5 | 293.0 |
Interest income |  | 6.4 | 8.0 |
Actuarial losses in other comprehensive income |  | 36.4 | 27.8 |
Administrative expenses paid from plan assets |  | (1.1) | (1.2) |
Employer contributions |  | 4.0 | 2.9 |
Employer direct benefit payments |  | 1.1 | 0.8 |
Employer direct settlement payments |  | 0.0 | 0.0 |
Settlement payments from employer |  | 0.0 | 0.0 |
Settlement payments from plan |  | 0.0 | 0.0 |
Benefit payments from plan |  | (12.5) | (12.0) |
Benefit payments from employer |  | (1.1) | (0.8) |
Foreign currency exchange rate changes and other |  | 16.4 | 10.0 |
Net defined benefit liability (asset) |  | 378.1 | 328.5 | 293.0
Other benefit plans |  |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |
Interest income |  | (2.4) | (2.6) | (2.6)
Administrative expenses paid from plan assets |  | 0.0 | 0.0 | 0.0
Other benefit plans | Plan assets |  |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |
Net defined benefit liability (asset) |  | 1.8 | 0.0 |
Interest income |  | 0.0 | 0.0 |
Actuarial losses in other comprehensive income |  | 0.0 | 0.0 |
Administrative expenses paid from plan assets |  | 0.0 | 0.0 |
Employer contributions |  | 0.4 | 0.9 |
Employer direct benefit payments |  | 2.6 | 3.0 |
Employer direct settlement payments |  | 4.8 | 5.2 |
Settlement payments from employer |  | (4.8) | (5.2) |
Settlement payments from plan |  | (0.1) | (0.2) |
Benefit payments from plan |  | (0.2) | (0.2) |
Benefit payments from employer |  | (2.6) | (3.0) |
Foreign currency exchange rate changes and other |  | 0.1 | 1.3 |
Net defined benefit liability (asset) |  | $ 2.0 | $ 1.8 | $ 0.0

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- Definition The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_f&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_e&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_140_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_g&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets, excluding amounts included in interest income or expense. The return on plans assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]; Interest expense (income), net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_c_i&doctype=Standard -URIDate 2020-01-01 + Details
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