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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, 2020
$ / shares
shares
Summary of performance share activity  
Outstanding, beginning of period (in shares) | shares 225
Granted (in shares) | shares 67
Adjustment for Condition Achieved (in shares) | shares 35
Vested (in shares) | shares (124)
Forfeited (in shares) | shares (1)
Outstanding, end of period (in shares) | shares 202
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Outstanding, beginning of period (in usd per share) | $ / shares $ 75.80
Granted (in usd per share) | $ / shares 105.66
Adjustment for Condition Achieved (in usd per share) | $ / shares 49.15
Vested (in usd per share) | $ / shares 49.15
Forfeited (in usd per share) | $ / shares 74.17
Outstanding, end of period (in usd per share) | $ / shares $ 97.97