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Pension and Non-pension Post-employment Benefit Plans - Expense Recognized in Consolidated Statement of Operations (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of defined benefit plans [line items] |  |  |
Total expense for the year | $ 810.7 | $ 815.2 | $ 804.7
Pension Plan |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Current service cost | 1.9 | 1.9 | 1.8
Interest cost | 0.5 | 0.6 | (0.8)
Past service cost (credit) and settlement/curtailment losses | (0.8) | 0.0 | 0.1
Plan administrative expenses and other | 1.1 | 1.5 | 1.3
Post-employment benefit expense, defined benefit plans | 2.7 | 4.0 | 2.4
Defined contribution pension plan expense | 10.6 | 10.1 | 9.6
Total expense for the year | 13.3 | 14.1 | 12.0
Past service cost and settlement/curtailment losses | 0.8 | 0.0 | (0.1)
Other benefit plans |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Current service cost | 3.2 | 2.6 | 2.2
Interest cost | 2.4 | 2.6 | 2.6
Past service cost (credit) and settlement/curtailment losses | 2.3 | 8.0 | 1.2
Plan administrative expenses and other | 0.0 | 0.0 | 0.0
Post-employment benefit expense, defined benefit plans | 7.9 | 13.2 | 6.0
Defined contribution pension plan expense | 0.0 | 0.0 | 0.0
Total expense for the year | 7.9 | 13.2 | 6.0
Past service cost and settlement/curtailment losses | $ (2.3) | $ (8.0) | $ (1.2)

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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [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 a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The expense of all forms of consideration given by an entity in exchange for a service rendered by employees or for the termination of employment. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 102 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_102&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_99&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 104 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_104&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; 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 b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of post-employment benefit expense relating to defined benefit plans. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 5 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_5&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of post-employment benefit expense relating to defined contribution plans. Defined contribution plans are post-employment benefit plans under which an entity pays fixed contributions into a separate entity (a fund) and will have no legal or constructive obligation to pay further contributions if the fund does not hold sufficient assets to pay all employee benefits relating to employee service in the current and prior periods. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 53 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_53&doctype=Standard -URIDate 2020-01-01 + Details
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