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INCOME TAXES - COMPONENTS OF TAX EXPENSE (BENEFIT) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Income Tax Disclosure [Abstract]        
Current tax expense $ 6.3 $ 14.9 $ 40.0 $ 19.9
Deferred tax expense 42.0 37.1 30.5 155.5
Total income tax expense $ 48.3 $ 52.0 $ 70.5 $ 175.4