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Commitments, Contingencies and Guarantees - Additional Information (Details) R$ in Millions, $ in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2017 CAD ($) | Jan. 31, 2017 USD ($) | Dec. 31, 2016 CAD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 CAD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 CAD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 BRL (R$) | Dec. 31, 2015 USD ($) | Apr. 07, 2015 USD ($)
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures principally for machinery and equipment |  |  |  |  |  |  |  |  | $ 27.5 |  |  |
Tax effect of reversal of provisions for tax uncertainties related to transfer pricing matter |  |  |  |  | $ 45 | $ 34.0 | $ 45 | $ 34.0 |  |  |  |
Tax effect of refund of interest income due to reversal of provisions for tax uncertainties related to transfer pricing matter |  |  |  |  | $ 19 | 14.0 |  | 14.3 |  |  |  |
Refund of cash deposited on account with the Canadian tax authorities | $ 6 | $ 4.0 | $ 70 | $ 52.0 |  |  |  |  |  |  |  |
Deferred tax liability |  |  |  | 34.8 |  | 34.8 |  | 34.8 | 27.5 |  | $ 25.8 |
Settling of inter-company debts |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax liability |  |  |  |  |  |  |  |  |  |  |  | $ 1.0
Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  | 227.5 |  | 227.5 |  | 227.5 | 187.5 |  |  |
Letters of credit outstanding |  |  |  | 25.8 |  | 25.8 |  | 25.8 | 23.2 |  |  |
Guarantees |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated financial effect of contingent liabilities |  |  |  | 37.8 |  | 37.8 |  | 37.8 | 36.8 |  |  |
Guarantees | Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  | 25.8 |  | 25.8 |  | 25.8 | 23.2 |  |  |
Research and development assessments against Brazilian Subsidiary |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated financial effect of contingent liabilities |  |  |  |  |  |  |  |  | 12.0 | R$ 39 |  |
Solar panel manufacturing equipment | Finance Lease Obligations |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  | $ 15.3 |  | $ 15.3 |  | $ 15.3 | $ 11.1 |  |  |

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