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INCOME TAX EXPENSE (RECOVERY) - Current and deferred tax expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Current tax expense (recovery)    
Current period $ 206.6 $ 137.8
Adjustment for prior period (1.0) (7.9)
Deferred tax expense    
Origination and reversal of temporary differences 223.0 55.8
Impact of changes in tax rate (1.6) (0.1)
Change in unrecognized deductible temporary differences (156.3) (35.6)
Recognition of previously unrecognized tax losses (24.0) (11.2)
Total tax expense $ 246.7 $ 138.8