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Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |  |
Accumulated other comprehensive income, beginning balance |  |  | $ (24.7) |  |
Foreign currency translation adjustments |  |  | 0.7 | $ 0.0 | $ (1.7)
Net gain (loss) on cash flow hedges |  |  | 27.9 | (2.2) | (39.2)
Reclassification of net loss (gain) on cash flow hedges to operations |  |  | (10.6) | 10.3 | 33.1
Actuarial gains (losses) on pension and non-pension post-employment benefit plans (note 19) |  |  | (1.2) | 17.1 | (7.0)
Reclassification of actuarial losses (gains) to deficit |  |  | 1.2 | (17.1) | 7.0
Settlement loss (note 19) |  |  | (17.0) | 0.0 | 0.0
Reclassification of settlement loss to deficit (note 19) |  |  | 17.0 | 0.0 | 0.0
Accumulated other comprehensive income, ending balance |  |  | (6.7) | (24.7) |
Income tax expense (recovery) relating to net loss on cash flow hedges |  |  | 2.8 | (1.2) | (2.8)
Income tax expense (recovery) relating to reclassification of net loss on cash flow hedges to operations |  |  | (0.3) | 1.1 | 2.9
Income tax expense (recovery) relating to cash flow hedges |  |  | 1.2 | (1.3) | (1.2)
Foreign currency |  |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |  |
Accumulated other comprehensive income, beginning balance |  |  | (15.2) | (15.2) | (13.5)
Accumulated other comprehensive income, ending balance |  |  | (14.5) | (15.2) | (15.2)
Cash flow hedges |  |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |  |
Accumulated other comprehensive income, beginning balance |  |  | (9.5) | (17.6) | (11.5)
Accumulated other comprehensive income, ending balance |  |  | 7.8 | (9.5) | (17.6)
Pension and non-pension post-employment benefit plans |  |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |  |
Accumulated other comprehensive income, beginning balance |  |  | 0.0 | 0.0 |
Actuarial gains (losses) on pension and non-pension post-employment benefit plans (note 19) |  | $ (17.0) |  |  |
Accumulated other comprehensive income, ending balance |  |  | 0.0 | 0.0 | 0.0
Accumulated other comprehensive loss |  |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |  |
Accumulated other comprehensive income, beginning balance |  |  | (24.7) | (32.8) |
Foreign currency translation adjustments | [1] |  | 0.7 |  | (1.7)
Accumulated other comprehensive income, ending balance |  |  | $ (6.7) | $ (24.7) | $ (32.8)
[1] | Accumulated other comprehensive income (loss) is net of tax. See note 14.

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- Definition The amount of accumulated items of income and expense (including reclassification adjustments) that are not recognised in profit or loss as required or permitted by other IFRSs. [Refer: IFRSs [member]; Other comprehensive income] + 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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