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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, 2020 | Dec. 31, 2019
Accumulated other comprehensive income (loss) |  |
Balance, beginning of period | $ (20.4) | $ (98.5)
Other comprehensive income (loss) before tax | (5.4) | 86.1
Tax | 2.1 | (8.0)
Balance, end of period | (23.7) | (20.4)
Long-term Investments |  |
Accumulated other comprehensive income (loss) |  |
Balance, beginning of period | (26.2) | (75.2)
Other comprehensive income (loss) before tax | 0.3 | 49.3
Tax |  | (0.3)
Balance, end of period | (25.9) | (26.2)
Derivative Contracts |  |
Accumulated other comprehensive income (loss) |  |
Balance, beginning of period | 5.8 | (23.3)
Other comprehensive income (loss) before tax | (5.7) | 36.8
Tax | 2.1 | (7.7)
Balance, end of period | $ 2.2 | $ 5.8

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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 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 91 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_91&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph IG6 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_IG6&doctype=Implementation%20Guidance -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 82A -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_82A&doctype=Standard -URIDate 2020-01-01 + Details
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