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INCOME TAXES - Reconciliation (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
INCOME TAXES    
Income (loss) before income taxes $ 192.1 $ (359.3)
Income tax expenses (recovery) at the combined basic federal and provincial tax rate (26.5% in 2023; and 26.5% in 2022) 50.9 (95.2)
Decrease (increase) resulting from:    
Permanent differences 124.6 (87.0)
Variance between combined Canadian tax rate and the tax rate applicable to U.S. earnings (0.7) 3.7
(Recognition) de-recognition of deferred income tax assets (15.8) 1.2
Other 0.9 1.2
Income tax expense (recovery) $ 159.9 $ (176.1)
Applicable tax rate 26.50% 26.50%