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STOCKHOLDERS' EQUITY - Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Text Block [Abstract]        
Income tax benefit (expense) for net gains (losses) recorded in other comprehensive income (loss) $ (7.4) $ 10.8 $ (22.0) $ 46.1