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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)