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Incentive Compensation Plans Schedule of Stock-based Compensation Expense (Tables)
 12 Months Ended
Dec. 31, 2024
Share-Based Payment Arrangement, Additional Disclosure [Abstract]  
Schedule of Stock-based Compensation Expense
The amounts of stock-based compensation expense as reflected in salaries and related expenses in our Consolidated Statements of Operations, and the related tax benefit, are listed below.
Years ended December 31,
202420232022
Stock-settled awards$36.7 $27.8 $26.3 
Cash-settled awards0.8 0.3 0.3 
Performance-based awards28.1 18.9 23.7 
Stock Options0.0 0.3 0.3 
Employee stock purchase plan2.6 2.9 3.1 
Other 1
3.0 2.7 2.0 
Stock-based compensation expense$71.2 $52.9 $55.7 
Tax benefit$17.0 $12.5 $13.1 
1Represents charges recorded for severance expense related to stock-based compensation awards.