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STOCKHOLDERS' EQUITY - Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Text Block [Abstract]        
Income tax benefit (expense) for net gains (losses) recorded in other comprehensive income (loss) $ (3.7) $ 5.6 $ (14.6) $ 35.3