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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Stock-Based Compensation Expense | Stock based compensation expense for the years ended December 31, 2019, 2018 and 2017 was as follows:
| 2019 |  | 2018 |  | 2017
Stock based compensation | $ | 104.5 |  |  | $ | 133.8 |  |  | $ | 83.1 |
Tax benefit recognized in net earnings | 22.0 |  |  | 28.1 |  |  | 29.1 |
Weighted-Average Assumptions of Stock-Based Compensation | The weighted-average fair value of options granted in 2019, 2018 and 2017 were calculated using the following weighted-average assumptions:
| 2019 |  | 2018 |  | 2017
Weighted-average fair value ($) | 68.05 |  |  | 57.75 |  |  | 40.87 |
Risk-free interest rate (%) | 2.37 |  |  | 2.65 |  |  | 2.03 |
Average expected option life (years) | 5.42 |  |  | 5.32 |  |  | 5.26 |
Expected volatility (%) | 19.22 |  |  | 18.05 |  |  | 18.74 |
Expected dividend yield (%) | 0.58 |  |  | 0.59 |  |  | 0.67 |
Share-Based Compensation Activity | The following table summarizes the Company’s activities with respect to its share-based compensation plans for the years ended December 31, 2019 and 2018:
| Number of shares |  | Weighted-average exercise price per share |  | Weighted-average contractual term |  | Aggregate intrinsic value
Outstanding at December 31, 2017 | 3.196 |  |  | $ | 140.68 |  |  |  |  |
Granted | 0.723 |  |  | 279.10 |  |  |  |  |
Exercised | (0.650 | ) |  | 90.43 |  |  |  |  |
Canceled | (0.064 | ) |  | 211.57 |  |  |  |  |
Outstanding at December 31, 2018 | 3.205 |  |  | 180.69 |  |  | 6.58 |  | $ | 284.0 |
Granted | 0.764 |  |  | 320.65 |  |  |  |  |  |
Exercised | (0.527 | ) |  | 122.94 |  |  |  |  |  |
Canceled | (0.093 | ) |  | 273.64 |  |  |  |  |  |
Outstanding at December 31, 2019 | 3.349 |  |  | 219.14 |  |  | 6.66 |  | $ | 452.8 |
Exercisable at December 31, 2019 | 1.611 |  |  | $ | 150.31 |  |  | 4.74 |  | $ | 328.6 |
Schedule of Stock-Based Compensation by Exercise Price Range | The following table summarizes information for stock options outstanding at December 31, 2019:
|  | Outstanding options |  | Exercisable options
Exercise price |  | Number |  | Average exercise price |  | Average remaining life (years) |  | Number |  | Average exercise price
$51.11 - $125.17 |  | 0.370 |  |  | $ | 95.34 |  |  | 2.0 |  | 0.370 |  |  | $ | 95.34 |
$125.18 - $154.16 |  | 0.371 |  |  | 137.31 |  |  | 4.1 |  | 0.371 |  |  | 137.31 |
$154.17 - $170.58 |  | 0.269 |  |  | 164.82 |  |  | 5.2 |  | 0.269 |  |  | 164.82 |
$170.59 - $183.97 |  | 0.393 |  |  | 173.20 |  |  | 6.4 |  | 0.362 |  |  | 172.75 |
$183.98 - $212.18 |  | 0.439 |  |  | 202.41 |  |  | 7.1 |  | 0.198 |  |  | 199.20 |
$212.19 - $279.31 |  | 0.357 |  |  | 261.80 |  |  | 8.3 |  | 0.039 |  |  | 233.39 |
$279.32 - $279.44 |  | 0.460 |  |  | 279.39 |  |  | 8.2 |  | 0.002 |  |  | 279.39 |
$279.45 - $327.91 |  | 0.597 |  |  | 321.33 |  |  | 9.1 |  | — |  |  | — |
$327.92 - $366.76 |  | 0.093 |  |  | 351.80 |  |  | 9.5 |  | — |  |  | — |
$51.11 - $366.76 |  | 3.349 |  |  | $ | 219.14 |  |  | 6.7 |  | 1.611 |  |  | $ | 150.31 |
Schedule of Nonvested Restricted Stock Awards Activity | A summary of the Company’s nonvested shares activity for 2019 and 2018 is as follows:
| Number of shares |  | Weighted-average grant date fair value
Nonvested at December 31, 2017 | 0.859 |  |  | $ | 187.01 |
Granted | 0.410 |  |  | 278.29 |
Vested | (0.492 | ) |  | 204.24 |
Forfeited | (0.038 | ) |  | 191.51 |
Nonvested at December 31, 2018 | 0.739 |  |  | $ | 225.93 |
Granted | 0.321 |  |  | 318.75 |
Vested | (0.290 | ) |  | 209.05 |
Forfeited | (0.061 | ) |  | 225.23 |
Nonvested at December 31, 2019 | 0.709 |  |  | $ | 275.00 |

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