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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Pretax Compensation Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Income tax benefits $ 7.7 $ 9.1 $ 6.9
Performance Shares, Restricted Stock Units, and Stock Options      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Pretax compensation expense $ 50.6 $ 60.6 $ 38.7