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INCOME TAX EXPENSE - Current and deferred tax expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Current tax expense    
Current period $ 297.7 $ 206.6
Adjustment for prior periods (75.8) (1.0)
Deferred tax expense    
Origination and reversal of temporary differences 335.5 223.0
Impact of changes in tax rate (0.8) (1.6)
Change in unrecognized deductible temporary differences (73.4) (156.3)
Recognition of previously unrecognized tax losses (43.4) (24.0)
Total tax expense $ 439.8 $ 246.7