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Income Taxes (Details) - CAD CAD in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
INCOME TAXES. |  |
Current year | CAD 1,150.0 | CAD 222.0
Adjustments to current income tax of prior years | 59.0 | (69.0)
Origination of temporary differences | 425.0 | (313.0)
Adjustments in respect of deferred income tax of prior years | (70.0) | 67.0
Changes in tax rates and legislation | (106.0) | (190.0)
Recognition of previously unrecognized deferred tax assets |  | (76.0)
Total tax expense (income) | CAD 1,458.0 | CAD (359.0)

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