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Stock-Based Compensation (Schedule Of Stock Unit Information) (Details)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
$ / shares
shares
Total Units  
Non-vested (in shares) 1.0
Granted based on current service (in shares) 0.9
Granted based on future conditions (in shares) 0.3
Vested (in shares) (0.8)
Forfeited (in shares) (0.4)
Non-vested (in shares) 1.0
Fully vested stock units outstanding (in shares) 3.5
Weighted Average Grant Date Fair Value per Unit  
Non-vested (in dollars per share) | $ / shares $ 42.34
Granted based on current service (in dollars per share) | $ / shares 29.74
Granted based on future conditions (in dollars per share) | $ / shares 14.66
Vested (in dollars per share) | $ / shares 30.39
Forfeited (in dollars per share) | $ / shares 23.95
Non-vested (in dollars per share) | $ / shares $ 42.38
Aggregate Intrinsic Value  
Total non-vested | $ $ 25.5
Fully vested shares available for issuance | $ $ 92.3
DSU  
Total Units  
Non-vested (in shares) 0.0
Granted based on current service (in shares) 0.2
Granted based on future conditions (in shares) 0.0
Vested (in shares) (0.2)
Forfeited (in shares) 0.0
Non-vested (in shares) 0.0
ESU  
Total Units  
Non-vested (in shares) 0.0
Granted based on current service (in shares) 0.3
Granted based on future conditions (in shares) 0.0
Vested (in shares) (0.3)
Forfeited (in shares) 0.0
Non-vested (in shares) 0.0
PSU  
Total Units  
Non-vested (in shares) 0.8
Granted based on current service (in shares) 0.0
Granted based on future conditions (in shares) 0.3
Vested (in shares) 0.0
Forfeited (in shares) (0.3)
Non-vested (in shares) 0.8
RSU  
Total Units  
Non-vested (in shares) 0.2
Granted based on current service (in shares) 0.4
Granted based on future conditions (in shares) 0.0
Vested (in shares) (0.3)
Forfeited (in shares) (0.1)
Non-vested (in shares) 0.2
Maximum | Performance Stock Unit Awards  
Aggregate Intrinsic Value  
Base award percentage of total shareholder return 200.00%