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INCOME TAX EXPENSE - Current and deferred tax expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Current tax expense    
Current period $ 376.3 $ 149.0
Settlement or adjustment for prior periods (1.1) 0.3
Deferred tax expense    
Origination and reversal of temporary differences 115.8 56.4
Settlement or adjustment for prior periods (32.6) 57.3
Change in unrecognized deferred tax assets from impairment (reversal) charges (17.8) 8.8
Change in unrecognized deferred tax assets 46.8 21.4
Total tax expense $ 487.4 $ 293.2