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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, 2018 | Dec. 31, 2017 | Jan. 01, 2017 | [1]
--- | --- | --- | --- | ---
Disclosure of defined benefit plans [line items] |  |  |  |
Pension and non-pension post-employment benefit obligations | $ (88.8) | $ (97.8) | [1] | $ (86.0)
Current other post-employment benefit obligations | (0.4) | (0.9) |  |
Non-current net pension assets (note 10) | 4.5 | 62.9 |  |
Excess (deficiency) of plan assets over accrued benefit obligations | (84.7) | (35.8) |  |
Pension Plans |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Pension and non-pension post-employment benefit obligations | (21.1) | (23.2) |  |
Current other post-employment benefit obligations | 0.0 | 0.0 |  |
Non-current net pension assets (note 10) | 4.5 | 62.9 |  |
Excess (deficiency) of plan assets over accrued benefit obligations | (16.6) | 39.7 |  |
Other Benefit Plans |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Pension and non-pension post-employment benefit obligations | (67.7) | (74.6) |  |
Current other post-employment benefit obligations | (0.4) | (0.9) |  |
Non-current net pension assets (note 10) | 0.0 | 0.0 |  |
Excess (deficiency) of plan assets over accrued benefit obligations | $ (68.1) | (75.5) |  |
Accrued and other current liabilities |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Current other post-employment benefit obligations |  | $ 0.9 |  |
[1] | Certain prior period figures have been restated to reflect the adoption of IFRS 15 (see note 2)

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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 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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