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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Stock-Based Compensation Plans [Abstract] |
Schedule Of Comparative Date For Performance Stock Units |
|  | 2020 Awards |  |  | 2019 Awards |  |  | 2018 Awards |
TSR Awards |  |  |  |  |  |  |  |  |
Shares of stock granted - target |  | 5,156 |  |  | 7,029 |  |  | 7,523 |
Per-share fair value | $ | 643.44 |  | $ | 434.51 |  | $ | 341.20 |
Volatility |  | 21.4 | % |  | 21.4 | % |  | 22.9 | %
Risk-free interest rate |  | 1.3 | % |  | 2.45 | % |  | 2.34 | %
EPS Awards |  |  |  |  |  |  |  |  |
Shares of stock granted - target |  | 5,156 |  |  | 7,029 |  |  | 7,523 |
Per-share fair value | $ | 487.90 |  | $ | 322.40 |  | $ | 256.29 |
Common Assumptions |  |  |  |  |  |  |  |  |
Service period (years) |  | 2.9 |  |  | 2.9 |  |  | 2.9 |
Three-year measurement period ends December 31, |  | 2022 |  |  | 2021 |  |  | 2020 |
Schedule Of Total Stock Option, Stock Award And PSU Activity |
| Stock Options |  | Stock Awards |  | Performance Units (PSUs)
|  |  |  |  |  |  |  |  |  |  |  |  |  | Weighted |  |  |  |  |
|  |  |  | Weighted Average |  |  | Aggregate |  |  |  |  | Average |  |  |  |  | Weighted
|  |  |  |  |  | Remaining |  |  | Intrinsic |  |  |  |  | Grant-Date |  | Number of |  |  | Average
| Number of |  |  | Exercise |  | Contractual |  |  | Value |  | Number of |  |  | Per-Share |  | Target |  |  | Grant-Date
| Options |  |  | Price |  | Life (Years) |  |  | (thousands) |  | Awards |  |  | Fair Value |  | Units |  |  | Price
Outstanding at January 1, 2020 | 1,205,948 |  | $ | 252.77 |  |  |  |  |  |  | - |  | $ | - |  | 42,978 |  | $ | 288.78
Granted | 298,670 |  |  | 471.74 |  |  |  |  |  |  | 2,511 |  |  | 466.43 |  | 22,378 |  |  | 365.12
Exercised/Vested | (419,145) |  |  | 176.73 |  |  |  |  |  |  | (2,511) |  |  | 466.34 |  | (26,454) |  |  | 197.02
Canceled/ Forfeited | (15,402) |  |  | 369.84 |  |  |  |  |  |  | - |  |  | - |  | (706) |  |  | 472.68
Outstanding at December 31, 2020 | 1,070,071 |  | $ | 341.99 |  | 3.5 |  | $ | 198,910 |  | - |  | $ | - |  | 38,196 |  | $ | 396.93
Vested and expected to vest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
at December 31, 2020 | 1,070,071 |  | $ | 341.99 |  | 3.5 |  | $ | 198,910 |  | - |  | *$ | - |  | 69,106 |  | *$ | 386.33
Exercisable at December 31, 2020 | 510,938 |  |  | 246.03 |  | 2.7 |  |  | 144,003 |  | n.a. |  |  | n.a. |  | n.a. |  |  | n.a.
* Amount includes 26,525 share units which vested and were converted to shares of stock and distributed in the first quarter of 2021.
Schedule Of Comparative Data For Stocks Option, Stock Awards And PSUs |
|  | Years Ended December 31,
|  | 2020 |  |  | 2019 |  |  | 2018
Total compensation expense of stock-based compensation |  |  |  |  |  |  |  |
plans charged against income | $ | 26,802 |  | $ | 21,338 |  | $ | 19,229
Total income tax benefit recognized in income for stock |  |  |  |  |  |  |  |
based compensation expense charged against income |  | 6,904 |  |  | 5,373 |  |  | 4,788
Total intrinsic value of stock options exercised |  | 125,448 |  |  | 106,793 |  |  | 102,144
Total intrinsic value of stock awards vested during the period |  | 1,171 |  |  | 767 |  |  | 4,003
Per-share weighted average grant-date fair value of |  |  |  |  |  |  |  |
stock awards granted |  | 466.43 |  |  | 331.69 |  |  | 333.75
Schedule Of Valuation Assumptions |
|  | 2020 |  |  | 2019 |  |  | 2018
Stock price on date of issuance | $ | 471.74 |  | $ | 413.19 |  | $ | 306.70
Grant date fair value per share | $ | 97.56 |  | $ | 78.06 |  | $ | 67.16
Number of options granted |  | 298,670 |  |  | 287,010 |  |  | 246,350
Expected term (years) |  | 3.5 |  |  | 4.0 |  |  | 4.0
Risk free rate of return |  | 0.24 | % |  | 1.65 | % |  | 2.99
Volatility |  | 28.41 | % |  | 21.25 | % |  | 22.42
Dividend yield |  | 0.3 | % |  | 0.3 | % |  | 0.4
Forfeiture rate |  | - |  |  | - |  |  | -
Schedule Of Other Data For Stock Options, Stock Awards And PSUs |
|  | Stock |  |  | Stock |  |  |
|  | Options |  |  | Awards |  |  | PSUs
Total unrecognized compensation at the end of the year | $ | 44,851 |  | $ | - |  | $ | 8,223
Weighted average period over which unrecognized compensation to be recognized (years) |  | 2.3 |  |  | - |  |  | 1.7
Actual income tax benefit realized | $ | 29,543 |  | $ | 276 |  | $ | 3,123
Aggregate intrinsic value vested and expected to vest | $ | 198,910 |  | $ | - |  | $ | 36,479

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