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Income Taxes - Additional Information (Details) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 CAD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) tax_incentive $ / shares | Dec. 31, 2016 CAD ($) | Dec. 31, 2016 USD ($) $ / shares | Dec. 31, 2015 USD ($) $ / shares
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |  |
Tax expense (income), continuing operations |  |  |  |  | $ 27,400,000 |  | $ 24,700,000 | $ 42,200,000
Solar 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 |  |  |  |  |  |  | 8,000,000 |
Tax effect of foreign currency expense |  |  |  |  |  |  | 7,300,000 | 12,200,000
Tax effect of revaluation of non-monetary balances from historical to current period-end exchange rates |  |  |  |  |  |  | 3,100,000 | 4,500,000
Tax effect resulting from increased local currency taxable profits |  |  |  |  |  |  | 4,200,000 | 7,700,000
Impairment | 0 | $ 0 |  |  |  |  | 21,200,000 | 12,200,000
Deductible temporary differences and unused tax losses for which no deferred tax assets have been recognized | 1,977,700,000 | 1,863,800,000 |  | 1,863,800,000 | 1,977,700,000 |  | 1,863,800,000 |
Temporary differences associated with investments in subsidiaries for which no deferred tax liabilities have been recognized | $ 0 | $ 0 |  | $ 0 | 0 |  | 0 |
Credited (charged) to net earnings |  |  |  |  | (12,200,000) |  | (13,100,000) |
Aggregate tax benefit from tax incentives |  |  |  |  | $ 7,600,000 |  | $ 7,300,000 | $ 11,600,000
Tax benefit from tax incentives, per share (in dollars per share) | $ / shares |  |  |  |  | $ 0.05 |  | $ 0.05 | $ 0.07
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 set to expire between 2019 and 2020 | tax_incentive |  |  |  |  | 2 |  |  |
Number of tax incentives | tax_incentive |  |  |  |  | 3 |  |  |

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