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Pension and Non-pension Post-employment Benefit Plans - Plan Balances Reported on Consolidated Balance Sheet (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of defined benefit plans [line items] |  |
Pension and non-pension post-employment benefit obligations | $ (117.3) | $ (107.1)
Current other post-employment benefit obligations | (0.7) | (1.1)
Non-current net pension assets | 5.6 | 5.1
Excess (deficiency) of plan assets over accrued benefit obligations | (112.4) | (103.1)
Pension Plan |  |
Disclosure of defined benefit plans [line items] |  |
Pension and non-pension post-employment benefit obligations | (24.4) | (22.6)
Current other post-employment benefit obligations | 0.0 | 0.0
Non-current net pension assets | 5.6 | 5.1
Excess (deficiency) of plan assets over accrued benefit obligations | (18.8) | (17.5)
Other benefit plans |  |
Disclosure of defined benefit plans [line items] |  |
Pension and non-pension post-employment benefit obligations | (92.9) | (84.5)
Current other post-employment benefit obligations | (0.7) | (1.1)
Non-current net pension assets | 0.0 | 0.0
Excess (deficiency) of plan assets over accrued benefit obligations | $ (93.6) | $ (85.6)

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- Definition The amount of current net defined benefit liability. [Refer: Net defined benefit liability] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
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