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Share-Based Compensation Plans (Summary of Performance-Based Share Grants) (Details) - Total Shareholder Return Performance-Based Shares - Performance Based Shares
shares in Thousands
 3 Months Ended
Mar. 31, 2023
$ / shares
shares
Summary of performance share activity  
Outstanding, beginning of period (in shares) | shares 178
Granted (in shares) | shares 65
Adjustment for Condition Achieved (in shares) | shares 40
Vested (in shares) | shares (102)
Forfeited (in shares) | shares 0
Outstanding, end of period (in shares) | shares 181
Weighted Average Grant Date Fair Value Per Share  
Outstanding, beginning of period (in usd per share) | $ / shares $ 100.67
Granted (in usd per share) | $ / shares 109.68
Adjustment for Condition Achieved (in usd per share) | $ / shares 102.55
Vested (in usd per share) | $ / shares 102.55
Forfeited (in usd per share) | $ / shares 0
Outstanding, end of period (in usd per share) | $ / shares $ 103.82