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Incentive Compensation Plans Schedule of Nonvested Stock Activity (Tables)
 12 Months Ended
Dec. 31, 2020
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 2020 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, 20204.7 $23.21 0.1 $23.20 5.6 $21.36 
Granted2.3 20.70 0.0 21.02 2.4 18.67 
Vested(0.9)23.71 0.0 22.12 (2.6)22.18 
Forfeited(0.4)22.55 0.0 23.14 (0.6)21.12 
Non-vested as of December 31, 20205.7 $22.18 0.1 $22.40 4.8 $19.61 
Total unrecognized compensation expense remaining$48.5 $1.1 $33.9 
Weighted-average years expected to be recognized over1.21.11.8