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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Accumulated other comprehensive income (loss) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Accumulated other comprehensive income (loss) |  |
Balance, beginning of period | $ 21.1 | $ 39.1
Adjustment on initial application of IFRS 9 | (56.3) |
Other comprehensive loss before tax | (103.8) | (18.8)
Tax | 21.0 | 0.8
Losses on cash flow hedges transferred to cost of non-financial assets | 19.5 |
Balance, end of period | (98.5) | 21.1
Income tax expense (recovery) relating to cash flow hedges - effective portion of changes in fair value | (20.9) | 4.8
Long-term Investments |  |
Accumulated other comprehensive income (loss) |  |
Balance, beginning of period | 6.9 | 23.6
Adjustment on initial application of IFRS 9 | (56.3) |
Other comprehensive loss before tax | (26.1) | (16.4)
Tax | 0.3 | (0.3)
Balance, end of period | (75.2) | 6.9
Derivative Contracts |  |
Accumulated other comprehensive income (loss) |  |
Balance, beginning of period | 14.2 | 15.5
Other comprehensive loss before tax | (77.7) | (2.4)
Tax | 20.7 | 1.1
Losses on cash flow hedges transferred to cost of non-financial assets | 19.5 |
Balance, end of period | (23.3) | $ 14.2
Income tax expense (recovery) relating to cash flow hedges - effective portion of changes in fair value | $ 10.0 |

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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 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amounts removed from equity and included in the initial cost or other carrying amount of a non-financial asset (liability) whose acquisition or incurrence was a hedged, highly probable forecast transaction, net of tax. [Refer: Carrying amount [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 23 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_23_e&doctype=Standard&book=b -URIDate 2018-03-16 + Details
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- Definition The amount of income tax relating to amounts recognised in other comprehensive income in relation to cash flow hedges. [Refer: Cash flow hedges [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph ab -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_ab&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 90 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_90&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of income tax relating to amounts recognised in other comprehensive income that will be reclassified to profit or loss. [Refer: Income tax relating to components of other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 91 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_91&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of other comprehensive income that will be reclassified to profit or loss, before tax. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph IG6 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_IG6&doctype=Implementation%20Guidance -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 82A -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_82A&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Amount after tax of changes in equity or changes in net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption. + References No definition available. + Details
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