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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
 6 Months Ended
Jun. 30, 2022
$ / shares
shares
Summary of performance share activity  
Outstanding, beginning of period (in shares) | shares 177
Granted (in shares) | shares 70
Adjustment for Condition Achieved (in shares) | shares 22
Vested (in shares) | shares (75)
Forfeited (in shares) | shares (7)
Outstanding, end of period (in shares) | shares 187
Weighted Average Grant Date Fair Value Per Share  
Outstanding, beginning of period (in usd per share) | $ / shares $ 102.96
Granted (in usd per share) | $ / shares 71.14
Adjustment for Condition Achieved (in usd per share) | $ / shares 89.62
Vested (in usd per share) | $ / shares 89.62
Forfeited (in usd per share) | $ / shares 87.54
Outstanding, end of period (in usd per share) | $ / shares $ 100.64