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Pension and Non-pension Post-employment Benefit Plans - Summary of Accrued Benefit Obligations (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) year | Dec. 31, 2016 USD ($) year | Dec. 31, 2015 USD ($)
Pension Plans |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Current service cost | $ (2.1) | $ (1.7) | $ (1.7)
Past service cost and settlement/curtailment losses | (1.9) | 0.0 | (1.0)
Interest cost | $ 1.3 | $ 1.6 | 1.6
Weighted average duration of defined benefit obligation | year | 19 | 19 |
Other Benefit Plans |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Current service cost | $ (2.0) | $ (1.9) | (2.0)
Past service cost and settlement/curtailment losses | (0.6) | 0.0 | (0.1)
Interest cost | $ (2.6) | $ (2.6) | (2.6)
Weighted average duration of defined benefit obligation | year | 14 | 14 |
Accrued benefit obligations | Pension Plans |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Accrued benefit obligations, beginning of year | $ 325.6 | $ 326.9 |
Current service cost | 2.1 | 1.7 |
Past service cost and settlement/curtailment losses | 1.9 | 0.0 |
Interest cost | 8.7 | 11.1 |
Actuarial (losses) gains in other comprehensive income from changes in demographic assumptions | 5.4 | (13.9) |
Actuarial (losses) gains in other comprehensive income from changes in financial assumptions | 2.9 | 82.9 |
Actuarial (losses) gains in other comprehensive income from experience adjustments | 0.1 | (12.9) |
Settlement payments from employer | 0.0 | 0.0 |
Settlement payments from plan | (11.7) | 0.0 |
Benefit payments from plan | (10.5) | (14.8) |
Benefit payments from employer | (0.1) | (2.0) |
Foreign currency exchange rate changes and other | 31.4 | (53.4) |
Accrued benefit obligations, end of year | 355.8 | 325.6 | 326.9
Accrued benefit obligations | Other Benefit Plans |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Accrued benefit obligations, beginning of year | 65.8 | 62.7 |
Current service cost | 2.0 | 1.9 |
Past service cost and settlement/curtailment losses | 0.6 | 0.0 |
Interest cost | 2.6 | 2.6 |
Actuarial (losses) gains in other comprehensive income from changes in demographic assumptions | 0.2 | (6.3) |
Actuarial (losses) gains in other comprehensive income from changes in financial assumptions | 2.9 | 5.8 |
Actuarial (losses) gains in other comprehensive income from experience adjustments | 0.6 | (0.1) |
Settlement payments from employer | (2.0) | 0.0 |
Settlement payments from plan | 0.0 | 0.0 |
Benefit payments from plan | 0.0 | 0.0 |
Benefit payments from employer | (2.5) | (2.2) |
Foreign currency exchange rate changes and other | 5.3 | 1.4 |
Accrued benefit obligations, end of year | $ 75.5 | $ 65.8 | $ 62.7

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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions that result in remeasurements of the net defined benefit liability (asset). Demographic assumptions deal with matters such as: (a) mortality; (b) rates of employee turnover, disability and early retirement; (c) the proportion of plan members with dependants who will be eligible for benefits; (d) the proportion of plan members who will select each form of payment option available under the plan terms; and (e) claim rates under medical plans. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_c_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph c -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_c_iii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from experience adjustments that result in remeasurements of the net defined benefit liability (asset). Experience adjustments deal with the effects of differences between the previous actuarial assumptions and what has actually occurred. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_c&doctype=Standard -URIDate 2017-03-09 + Details
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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 2017-01-01 -Paragraph 141 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_a&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 141 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_e&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_140_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan in respect of settlements. [Refer: Gains (losses) arising from settlements, net defined benefit liability (asset); Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_g&doctype=Standard -URIDate 2017-03-09 + Details
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