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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |
Weighted-Average Assumptions Used for Estimating the Fair Value of Option Rights | The fair value of the Company’s option rights was estimated at the date of grant using a Black-Scholes-Merton option-pricing model with the following weighted-average assumptions for all options granted:
| 2021 |  | 2020 |  | 2019
Risk-free interest rate | 1.11 | % |  | .39 | % |  | 1.64 | %
Expected life of option rights | 5.05 years |  | 5.05 years |  | 5.05 years
Expected dividend yield of stock | .75 | % |  | .88 | % |  | .87 | %
Expected volatility of stock | 26.8 | % |  | 26.7 | % |  | 23.2 | %
Summary of Non-Qualified and Incentive Stock Option Right Activity | A summary of the Company’s non-qualified and incentive stock option right activity is shown in the following table:
| 2021 |  | 2020 |  | 2019
| Optioned Shares |  | Weighted- Average Exercise Price Per Share |  | Aggregate Intrinsic Value (in millions) |  | Optioned Shares |  | Weighted- Average Exercise Price Per Share |  | Aggregate Intrinsic Value (in millions) |  | Optioned Shares |  | Weighted- Average Exercise Price Per Share |  | Aggregate Intrinsic Value (in millions)
Outstanding at beginning of year | 10,503,378 |  |  | $ | 120.34 |  |  |  |  | 12,119,187 |  |  | $ | 96.82 |  |  |  |  | 13,455,747 |  |  | $ | 79.51 |  |  |
Granted | 972,575 |  |  | 292.15 |  |  |  |  | 1,373,793 |  |  | 213.39 |  |  |  |  | 1,496,658 |  |  | 183.11 |  |  |
Exercised | (2,362,173) |  |  | 82.50 |  |  |  |  | (2,872,836) |  |  | 63.63 |  |  |  |  | (2,706,498) |  |  | 57.12 |  |  |
Forfeited | (124,967) |  |  | 195.90 |  |  |  |  | (113,715) |  |  | 170.80 |  |  |  |  | (120,936) |  |  | 126.71 |  |  |
Expired | (5,878) |  |  | 141.27 |  |  |  |  | (3,051) |  |  | 139.55 |  |  |  |  | (5,784) |  |  | 115.23 |  |  |
Outstanding at end of year | 8,982,935 |  |  | $ | 147.83 |  |  | $ | 1,835.5 |  |  | 10,503,378 |  |  | $ | 120.34 |  |  | $ | 1,309.1 |  |  | 12,119,187 |  |  | $ | 96.82 |  |  | $ | 1,184.0 |
Exercisable at end of year | 6,713,727 |  |  | $ | 116.32 |  |  | $ | 1,583.4 |  |  | 7,681,440 |  |  | $ | 95.07 |  |  | $ | 1,151.5 |  |  | 8,920,968 |  |  | $ | 75.50 |  |  | $ | 1,061.7 |
Summary of RSU Activity | A summary of the Company’s RSU activity for the years ended December 31 is shown in the following table:
| 2021 |  | 2020 |  | 2019
Outstanding at beginning of year | 625,383 |  |  | 744,516 |  |  | 871,206 |
Granted | 196,526 |  |  | 287,919 |  |  | 393,825 |
Vested | (276,948) |  |  | (386,685) |  |  | (506,190) |
Forfeited | (34,281) |  |  | (20,367) |  |  | (14,325) |
Outstanding at end of year | 510,680 |  |  | 625,383 |  |  | 744,516 |

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- Definition Share based compensation arrangement by share based payment award fair value assumption company's non qualified incentive stock option right employees and nonemployee directors. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment grants company's Restricted stock. + References No definition available. + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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