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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2019
Stock-Based Compensation Plans [Abstract] |
Schedule Of Comparative Date For Performance Stock Units |
|  | 2019 Awards |  |  | 2018 Awards |  |  | 2017 Awards |
TSR Awards |  |  |  |  |  |  |  |  |
Shares of stock granted - target |  | 7,029 |  |  | 7,523 |  |  | 7,304 |
Per-share fair value | $ | 434.51 |  | $ | 341.20 |  | $ | 226.95 |
Volatility |  | 21.4 | % |  | 22.9 | % |  | 21.8 | %
Risk-free interest rate |  | 2.45 | % |  | 2.34 | % |  | 1.44 | %
EPS Awards |  |  |  |  |  |  |  |  |
Shares of stock granted - target |  | 7,029 |  |  | 7,523 |  |  | 7,304 |
Per-share fair value | $ | 322.40 |  | $ | 256.29 |  | $ | 172.60 |
Common Assumptions |  |  |  |  |  |  |  |  |
Service period (years) |  | 2.9 |  |  | 2.9 |  |  | 2.9 |
Three-year measurement period ends December 31, |  | 2021 |  |  | 2020 |  |  | 2019 |
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, 2019 | 1,395,034 |  | $ | 181.82 |  |  |  |  |  |  | - |  | $ | - |  | 48,160 |  | $ | 207.17
Granted | 287,010 |  |  | 413.19 |  |  |  |  |  |  | 2,313 |  |  | 331.69 |  | 27,688 |  |  | 253.44
Exercised/Vested | (464,661) |  |  | 139.78 |  |  |  |  |  |  | (2,313) |  |  | 331.69 |  | (32,136) |  |  | 136.48
Canceled/ Forfeited | (11,435) |  |  | 215.86 |  |  |  |  |  |  | - |  |  | - |  | (734) |  |  | 269.08
Outstanding at December 31, 2019 | 1,205,948 |  | $ | 252.77 |  | 3.3 |  | $ | 225,226 |  | - |  | $ | - |  | 42,978 |  | $ | 288.78
Vested and expected to vest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
at December 31, 2019 | 1,205,948 |  | $ | 252.77 |  | 3.3 |  | $ | 225,226 |  | - |  | *$ | - |  | 82,603 |  | *$ | 290.11
Exercisable at December 31, 2019 | 654,424 |  |  | 172.20 |  | 2.6 |  |  | 174,949 |  | n.a. |  |  | n.a. |  | n.a. |  |  | n.a.
* Amount includes 27,761 share units which vested and were converted to shares of stock and distributed in the first quarter of 2020.
Schedule Of Comparative Data For Stocks Option, Stock Awards And PSUs |
|  | Years Ended December 31,
|  | 2019 |  |  | 2018 |  |  | 2017
Total compensation expense of stock-based compensation |  |  |  |  |  |  |  |
plans charged against income | $ | 21,338 |  | $ | 19,229 |  | $ | 16,256
Total income tax benefit recognized in income for stock |  |  |  |  |  |  |  |
based compensation expense charged against income |  | 5,373 |  |  | 4,788 |  |  | 5,690
Total intrinsic value of stock options exercised |  | 106,793 |  |  | 102,144 |  |  | 50,192
Total intrinsic value of stock awards vested during the period |  | 767 |  |  | 4,003 |  |  | 6,983
Per-share weighted average grant-date fair value of |  |  |  |  |  |  |  |
stock awards granted |  | 331.69 |  |  | 333.75 |  |  | 203.52
Schedule Of Valuation Assumptions |
|  | 2019 |  |  | 2018 |  |  | 2017
Stock price on date of issuance | $ | 413.19 |  | $ | 306.70 |  | $ | 231.91
Grant date fair value per share | $ | 78.06 |  | $ | 67.16 |  | $ | 46.27
Number of options granted |  | 287,010 |  |  | 246,350 |  |  | 330,550
Expected term (years) |  | 4.0 |  |  | 4.0 |  |  | 4.0
Risk free rate of return |  | 1.65 | % |  | 2.99 | % |  | 1.86
Volatility |  | 21.25 | % |  | 22.42 | % |  | 22.80
Dividend yield |  | 0.3 | % |  | 0.4 | % |  | 0.5
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 | $ | 34,640 |  | $ | - |  | $ | 7,475
Weighted average period over which unrecognized compensation to be recognized (years) |  | 2.3 |  |  | - |  |  | 1.7
Actual income tax benefit realized | $ | 25,193 |  | $ | 181 |  | $ | 2,489
Aggregate intrinsic value vested and expected to vest | $ | 225,226 |  | $ | - |  | $ | 36,306

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