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Incentive Compensation Plans Schedule of Nonvested Stock Activity (Tables)
 12 Months Ended
Dec. 31, 2023
Summary of Stock Options Assumptions [Abstract]  
Schedule of Nonvested Share Activity [Table Text Block]
A summary of the activity of our non-vested stock-settled awards, cash-settled awards and performance-based awards during 2023 is presented below (performance-based awards are shown at 100% of the shares originally granted).
 Stock-Settled AwardsCash-Settled AwardsPerformance-Based Awards
 AwardsWeighted-
Average
Grant-Date
Fair Value
(per award)		AwardsWeighted-
Average
Grant-Date
Fair Value
(per award)		AwardsWeighted-
Average
Grant-Date
Fair Value
(per award)
Non-vested as of January 1, 20233.5 $27.52 0.0 $27.96 2.9 $24.31 
Reinstated
0.1 29.25 0.0 0.0 0.0 33.26 
Granted1.4 35.54 0.0 35.71 2.1 26.31 
Vested(1.7)21.92 0.0 21.02 (2.4)18.03 
Forfeited(0.4)31.04 0.0 34.96 (0.3)27.82 
Non-vested as of December 31, 20232.9 $34.20 0.0 $36.05 2.3 $32.09 
Total unrecognized compensation expense remaining$47.9 $0.7 $34.1 
Weighted-average years expected to be recognized over1.41.71.8