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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Accumulated other comprehensive income (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Accumulated other comprehensive income |  |
Balance, beginning of period | $ 39.1 | $ (31.3)
Other comprehensive income (loss) before tax | (18.8) | 79.9
Tax | 0.8 | (9.5)
Balance, end of period | 21.1 | 39.1
Long-term Investments |  |
Accumulated other comprehensive income |  |
Balance, beginning of period | 23.6 | (18.7)
Other comprehensive income (loss) before tax | (16.4) | 42.3
Tax | (0.3) |
Balance, end of period | 6.9 | 23.6
Derivative Contracts |  |
Accumulated other comprehensive income |  |
Balance, beginning of period | 15.5 | (12.6)
Other comprehensive income (loss) before tax | (2.4) | 37.6
Tax | 1.1 | (9.5)
Balance, end of period | $ 14.2 | $ 15.5

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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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- 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 2017-01-01 -Paragraph 91 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_91&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph IG6 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_IG6&doctype=Implementation%20Guidance -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 82A -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_82A&doctype=Standard -URIDate 2017-03-09 + Details
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