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Income Taxes - Additional Information (Details) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 31, 2017 CAD ($) | Jan. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CAD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 CAD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2018 USD ($) tax_incentive $ / shares | Dec. 31, 2017 USD ($) $ / shares | Dec. 31, 2016 CAD ($) | Dec. 31, 2016 USD ($) $ / shares
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense (recovery) |  |  |  |  |  |  |  | $ (17,000,000) | $ 27,600,000 | [1] |  | $ 24,700,000 | [1]
Deferred tax liabilities as a result of acquisitions |  |  |  |  |  |  |  | 56,600,000 |  |  |  |  |
Reversal of previously accrued Mexican taxes |  |  |  |  |  |  |  | 6,000,000 |  |  |  |  |
Solar tax benefit |  |  |  |  |  |  |  | 4,300,000 |  |  |  |  |
Increase to deferred income tax expense as a result of revaluing net deferred tax assets |  |  | $ 2,000,000 |  |  |  |  |  | 2,000,000 |  |  |  |
Tax effect of reversal of provisions for tax uncertainties related to transfer pricing matter |  |  |  |  |  | $ 45 | $ 34,000,000 |  |  |  | $ 45 | 34,000,000 |
Tax effect of refund of interest income due to reversal of provisions for tax uncertainties related to transfer pricing matter |  |  |  |  |  | $ 19 | $ 14,000,000 |  |  |  |  | 14,300,000 |
Tax effect of repatriation of foreign earnings |  |  |  |  |  |  |  |  |  |  |  | 1,500,000 |
Foreign earnings repatriated |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |
Deferred tax expense related to taxable temporary differences, repatriation of undistributed foreign earnings |  |  |  |  |  |  |  |  | 4,000,000 |  |  | 8,000,000 |
Tax effect of foreign currency expense |  |  |  |  |  |  |  |  |  |  |  | 7,300,000 |
Non-cash charges |  |  |  |  |  |  |  | 200,000 | 3,800,000 |  |  | 21,200,000 |
Deductible temporary differences and unused tax losses for which no deferred tax assets have been recognized |  |  | 1,977,700,000 |  |  |  |  | 1,780,400,000 | 1,977,700,000 |  |  |  |
Temporary differences associated with investments in subsidiaries for which no deferred tax liabilities have been recognized |  |  | $ 0 |  |  |  |  | 5,800,000 | 0 |  |  |  |
Deferred tax assets recognized with respect to losses |  |  |  |  |  |  |  | 56,000,000 | (12,200,000) |  |  |  |
Aggregate tax benefit from tax incentives |  |  |  |  |  |  |  | $ 4,700,000 | $ 7,600,000 |  |  | $ 7,300,000 |
Tax benefit from tax incentives, per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.03 | $ 0.05 |  |  | $ 0.05 |
Initial percentage of tax exemption |  |  |  |  |  |  |  | 100.00% |  |  |  |  |
Initial term of tax exemption |  |  |  |  |  |  |  | 8 years |  |  |  |  |
Percentage of tax exemption |  |  |  |  |  |  |  | 50.00% |  |  |  |  |
Term of tax exemption |  |  |  |  |  |  |  | 5 years |  |  |  |  |
Number of tax incentives | tax_incentive |  |  |  |  |  |  |  | 3 |  |  |  |  |
Income taxes paid (refund) | $ (6) | $ (4,000,000) |  | $ (70) | $ (52,000,000) |  |  |  |  |  |  |  |
Atrenne |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Tax benefit related to previously unrecognized tax assets |  |  |  |  |  |  |  | $ 3,700,000 |  |  |  |  |
Impakt |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Tax benefit related to previously unrecognized tax assets |  |  |  |  |  |  |  | 49,600,000 |  |  |  |  |
U.S. group of subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax assets recognized with respect to losses |  |  |  |  |  |  |  | $ 5,000,000 |  |  |  |  |
[1] | Certain prior period figures have been restated to reflect the adoption of IFRS 15 (see note 2)

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