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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, 2022
USD ($)
$ / shares
shares
Total Units  
Non-vested (in shares) 1.0
Granted based on current service (in shares) 0.7
Granted based on future conditions (in shares) 0.3
Vested (in shares) (0.8)
Forfeited (in shares) (0.2)
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 $ 44.41
Granted based on current service (in dollars per share) | $ / shares 35.78
Granted based on future conditions (in dollars per share) | $ / shares 17.99
Vested (in dollars per share) | $ / shares 38.21
Forfeited (in dollars per share) | $ / shares 21.33
Non-vested (in dollars per share) | $ / shares $ 42.34
Aggregate Intrinsic Value  
Total non-vested | $ $ 30.7
Fully vested shares available for issuance | $ $ 111.6
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) 0.2
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
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) (0.1)
Forfeited (in shares) (0.2)
Non-vested (in shares) 0.8
RSU  
Total Units  
Non-vested (in shares) 0.2
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) 0.2
Maximum | Performance Stock Unit Awards  
Aggregate Intrinsic Value  
Base award percentage of total shareholder return 200.00%