XML 253 R93.htm IDEA: XBRL DOCUMENT v3.22.0.1
Stock-Based Compensation (Summary Of Nonvested Shares) (Details) - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Performance Share Units | Market Condition PSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of shares issued per share unit, minimum 0.00%    
Percentage of shares issued per share unit, maximum 200.00%    
Fully Vested Undistributed Retirement-eligible units (in shares) 357,575 366,243  
Vesting period 3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Share Units, Nonvested at beginning of year (in shares) 464,139    
Share Units, Granted (in shares) 266,081    
Share Units, Unearned or forfeited (in shares) (21,143)    
Share Units, Undistributed Vested Units (in shares) (186,792)    
Share Units, Vested and distributed (in shares) (93,499)    
Share Units, Performance Adjustment (in shares) 0    
Share Units, Nonvested at end of year (in shares) 428,786 464,139  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Weighted-average Fair Value per Unit, Nonvested at beginning of year (in dollars per share) $ 73.34    
Fair value of share units awarded 87.11 $ 82.49 $ 67.42
Weighted-average Fair Value per Unit, Unearned or forfeited (in dollars per share) 80.77    
Weighted-average Fair Value per Unit, Vested and undistributed (in dollars per share) 77.91    
Weighted-average Fair Value per Unit, Vested and distributed (in dollars per share) 62.88    
Weighted-average Fair Value per Unit, Performance Adjustment (in dollars per share) 0    
Weighted-average Fair Value per Unit, Nonvested at end of year (in dollars per share) $ 81.81 $ 73.34  
Performance Share Units | Performance Condition PSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of shares issued per share unit, minimum 0.00%    
Percentage of shares issued per share unit, maximum 200.00%    
Fully Vested Undistributed Retirement-eligible units (in shares) 22,739 7,607  
Vesting period 3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Share Units, Nonvested at beginning of year (in shares) 31,896    
Share Units, Granted (in shares) 42,672    
Share Units, Unearned or forfeited (in shares) (2,449)    
Share Units, Undistributed Vested Units (in shares) (15,134)    
Share Units, Vested and distributed (in shares) 0    
Share Units, Performance Adjustment (in shares) (13,881)    
Share Units, Nonvested at end of year (in shares) 43,104 31,896  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Weighted-average Fair Value per Unit, Nonvested at beginning of year (in dollars per share) $ 76.66    
Fair value of share units awarded 78.11    
Weighted-average Fair Value per Unit, Unearned or forfeited (in dollars per share) 77.55    
Weighted-average Fair Value per Unit, Vested and undistributed (in dollars per share) 77.27    
Weighted-average Fair Value per Unit, Vested and distributed (in dollars per share) 0    
Weighted-average Fair Value per Unit, Performance Adjustment (in dollars per share) 77.54    
Weighted-average Fair Value per Unit, Nonvested at end of year (in dollars per share) $ 77.54 $ 76.66  
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fully Vested Undistributed Retirement-eligible units (in shares) 164,000 160,034  
Vesting period 38 months    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Share Units, Nonvested at beginning of year (in shares) 303,695    
Share Units, Granted (in shares) 129,723    
Share Units, Unearned or forfeited (in shares) (10,209)    
Share Units, Undistributed Vested Units (in shares) (87,427)    
Share Units, Vested and distributed (in shares) (87,597)    
Share Units, Performance Adjustment (in shares) 0    
Share Units, Nonvested at end of year (in shares) 248,185 303,695  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Weighted-average Fair Value per Unit, Nonvested at beginning of year (in dollars per share) $ 68.52    
Fair value of share units awarded 78.17    
Weighted-average Fair Value per Unit, Unearned or forfeited (in dollars per share) 74.88    
Weighted-average Fair Value per Unit, Vested and undistributed (in dollars per share) 73.13    
Weighted-average Fair Value per Unit, Vested and distributed (in dollars per share) 56.38    
Weighted-average Fair Value per Unit, Performance Adjustment (in dollars per share) 0    
Weighted-average Fair Value per Unit, Nonvested at end of year (in dollars per share) $ 75.97 $ 68.52