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Other Charges - Pension Obligation Settlement Loss (Gain) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Disclosure of defined benefit plans [line items] |  |  |  |  |  |
Actuarial losses recognized during the year |  |  | $ 1.2 | $ (17.1) | $ 7.0 |
Non-cash gain (loss) on purchase of annuity recorded in statement of operations | $ (1.9) |  | $ (1.9) | $ 0.0 | 0.3 |
Canadian defined benefit plans |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |
Non-cash gain (loss) on purchase of annuity recorded in statement of operations |  |  |  |  | $ 0.3 | $ (6.4)
Pension and non-pension post-employment benefit plans |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |
Actuarial losses recognized during the year |  | $ 17.0 |  |  |  |

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- Definition The amount of other comprehensive income, net of tax, related to gains (losses) on remeasurements of defined benefit plans, which comprise actuarial gains and losses; the return on plan assets, excluding amounts included in net interest on the net defined benefit liability (asset); and any change in the effect of the asset ceiling, excluding amounts included in net interest on the net defined benefit liability (asset). [Refer: Other comprehensive income; Defined benefit plans [member]; Plan assets [member]; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_91_a&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_7&doctype=Standard -URIDate 2017-03-09 + Details
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