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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Total Stock-Based Compensation Expense | Total stock-based compensation expense in our Consolidated Statements of (Loss) Income during the twelve months ended December 31, 2019, 2018 and 2017, was as follows:
|  | Twelve Months Ended December 31, |  |  |  |
|  | 2019 |  | 2018 |  | 2017
|  | (In millions) |  |  |  |
Cost of services |  | $ | 10.7 |  |  | $ | 9.5 |  |  | $ | 7.2 |
Selling, general and administrative expenses |  | 39.0 |  |  | 33.0 |  |  | 31.1 |
Stock-based compensation expense, before income taxes |  | $ | 49.7 |  |  | $ | 42.5 |  |  | $ | 38.3 |
Assumptions Used to Estimate Fair Value of Stock Options Granted | The fair value for stock options granted during the twelve months ended December 31, 2019, 2018 and 2017, was estimated at the date of grant, using the binomial model with the following weighted-average assumptions:
| Twelve Months Ended December 31, |  |  |  |
| 2019 |  | 2018 |  | 2017
Dividend yield | 1.3 | % |  | 1.2 | % |  | 1.9 | %
Expected volatility | 23.0 | % |  | 21.8 | % |  | 22.8 | %
Risk-free interest rate | 2.4 | % |  | 2.7 | % |  | 1.1 | %
Expected term (in years) | 4.7 |  | 4.8 |  | 4.8
Weighted-average fair value of stock options granted | $ | 14.97 |  |  | $ | 24.34 |  |  | $ | 22.20 |
Changes in Outstanding Options and Weighed-Average Exercise Price Per Share | The following table summarizes changes in outstanding stock options during the twelve months ended December 31, 2019, as well as stock options that are vested and expected to vest and stock options exercisable at December 31, 2019:
| Shares |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Term |  | Aggregate Intrinsic Value
| (In thousands) |  |  |  | (In years) |  | (In millions)
Outstanding at December 31, 2018 | 1,462 |  |  | $ | 103.50 |  |  |  |  |
Granted (all at market price) | 740 |  |  | $ | 112.48 |  |  |  |  |
Exercised | (307) |  |  | $ | 72.45 |  |  |  |  |
Forfeited and canceled | (70) |  |  | $ | 123.62 |  |  |  |  |
Outstanding at December 31, 2019 | 1,825 |  |  | $ | 122.46 |  |  | 6.2 |  | $ | 34.9 |
Vested and expected to vest at December 31, 2019 | 1,709 |  |  | $ | 122.13 |  |  | 6.2 |  | $ | 33.3 |
Exercisable at December 31, 2019 | 643 |  |  | $ | 104.95 |  |  | 5.8 |  | $ | 22.6 |
The following table summarizes changes in outstanding options and the related weighted-average exercise price per share for the twelve months ended December 31, 2018 and 2017:
| December 31, |  |  |  |  |  |
| 2018 |  |  |  | 2017 |  |
| Shares |  | Weighted- Average Price |  | Shares |  | Weighted- Average Price
| (In thousands) |  |  |  | (In thousands) |  |
Outstanding at the beginning of the year | 1,184 |  |  | $ | 87.64 |  |  | 1,228 |  |  | $ | 66.81 |
Granted (all at market price) | 553 |  |  | $ | 122.35 |  |  | 401 |  |  | $ | 114.66 |
Exercised | (212) |  |  | $ | 60.55 |  |  | (398) |  |  | $ | 48.23 |
Forfeited and canceled | (63) |  |  | $ | 114.67 |  |  | (47) |  |  | $ | 103.13 |
Outstanding at the end of the year | 1,462 |  |  | $ | 103.50 |  |  | 1,184 |  |  | $ | 87.64 |
Exercisable at end of year | 631 |  |  | $ | 80.81 |  |  | 636 |  |  | $ | 62.62 |
Summary of Changes in Nonvested Stock and Weighted-Average Grant Date Fair Value | The following table summarizes changes in these other stock awards during the twelve months ended December 31, 2019, 2018 and 2017 and the related weighted-average grant date fair value:
| Shares |  | Weighted-Average Grant Date Fair Value
| (In thousands) |  |
Nonvested at December 31, 2016 | 1,187 |  |  | $ | 87.54 |
Granted | 498 |  |  | $ | 89.45 |
Vested | (632) |  |  | $ | 56.53 |
Forfeited | (42) |  |  | $ | 104.24 |
Nonvested at December 31, 2017 | 1,011 |  |  | $ | 109.48 |
Granted | 563 |  |  | $ | 109.71 |
Vested | (417) |  |  | $ | 87.09 |
Forfeited | (82) |  |  | $ | 115.40 |
Nonvested at December 31, 2018 | 1,075 |  |  | $ | 120.11 |
Granted | 386 |  |  | $ | 115.68 |
Vested | (256) |  |  | $ | 127.17 |
Forfeited | (164) |  |  | $ | 119.36 |
Nonvested at December 31, 2019 | 1,041 |  |  | $ | 118.25 |

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