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Stock-Based Compensation
 3 Months Ended
Mar. 31, 2024
Share-Based Payment Arrangement [Abstract]  
Stock-Based Compensation Stock-Based CompensationThe following table recaps the impact of stock-based compensation on the results of operations for each of the periods presented:
 Three Months Ended 
 March 31, 2024		Three Months Ended 
 March 31, 2023
To be settled with stockTo be settled in cashTo be settled with stockTo be settled in cash
Executive Stock Unit (ESU) Program matching contributions $.6 $.2 $.7 $.1 
Discounts on various stock awards:
Deferred Stock Compensation Program.4 — .3 — 
ESU Program.3 — .2 — 
Discount Stock Plan.2 — .2 — 
Performance Stock Unit (PSU) awards(.2)(.5)1.1 .7 
Restricted Stock Unit (RSU) awards6.3 — 5.3 — 
Other, primarily non-employee directors restricted stock.4 — .4 — 
Total stock-based compensation expense (income)8.0 $(.3)8.2 $.8 
Employee contributions for above stock plans2.0 1.5 
Total stock-based compensation$10.0 $9.7 
Tax benefits on stock-based compensation expense$2.0 $2.0 
Tax (expense)/benefits on stock-based compensation payments (.8).3 
Total tax benefits associated with stock-based compensation$1.2 $2.3