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Pension and Non-pension Post-employment Benefit Plans - Plans Balances Reported on Consolidated Balance Sheet (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of defined benefit plans [line items] |  |
Pension and non-pension post-employment benefit obligations | $ (97.8) | $ (86.0)
Current other post-employment benefit obligations | (0.9) | 0.0
Non-current net pension assets (note 10) | 62.9 | 71.8
Excess (deficiency) of plan assets over accrued benefit obligations | (35.8) | (14.2)
Pension Plans |  |
Disclosure of defined benefit plans [line items] |  |
Pension and non-pension post-employment benefit obligations | (23.2) | (20.2)
Current other post-employment benefit obligations | 0.0 | 0.0
Non-current net pension assets (note 10) | 62.9 | 71.8
Excess (deficiency) of plan assets over accrued benefit obligations | 39.7 | 51.6
Other Benefit Plans |  |
Disclosure of defined benefit plans [line items] |  |
Pension and non-pension post-employment benefit obligations | (74.6) | (65.8)
Current other post-employment benefit obligations | (0.9) | 0.0
Non-current net pension assets (note 10) | 0.0 | 0.0
Excess (deficiency) of plan assets over accrued benefit obligations | (75.5) | $ (65.8)
Accrued and other current liabilities |  |
Disclosure of defined benefit plans [line items] |  |
Current other post-employment benefit obligations | $ 0.9 |

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- Definition Defined Benefit Plan, Amounts For Asset (Liability) Recognized In Statement Of Financial Position + References No definition available. + Details
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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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- Definition The amount of non-current net defined benefit asset. [Refer: Net defined benefit asset] + 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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