XML 155 R99.htm IDEA: XBRL DOCUMENT v3.8.0.1
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