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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Total Stock-Based Compensation Expense Total stock-based compensation expense in our Consolidated Statements of Income (Loss) during the twelve months ended December 31, 2020, 2019 and 2018, was as follows:
 Twelve Months Ended December 31,
202020192018
(In millions)
Cost of services$11.2 $10.7 $9.5 
Selling, general and administrative expenses43.5 39.0 33.0 
Stock-based compensation expense, before income taxes$54.7 $49.7 $42.5 
Assumptions Used to Estimate Fair Value of Stock Options Granted
The fair value for stock options granted during the twelve months ended December 31, 2020, 2019 and 2018, was estimated at the date of grant, using the binomial model with the following weighted-average assumptions:
 Twelve Months Ended December 31,
 202020192018
Dividend yield1.3 %1.3 %1.2 %
Expected volatility23.5 %23.0 %21.8 %
Risk-free interest rate1.3 %2.4 %2.7 %
Expected term (in years)4.44.74.8
Weighted-average fair value of stock options granted$24.29 $14.97 $24.34 
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, 2020, as well as stock options that are vested and expected to vest and stock options exercisable at December 31, 2020: 
SharesWeighted-Average Exercise PriceWeighted-Average Remaining Contractual TermAggregate Intrinsic Value
 (In thousands) (In years)(In millions)
Outstanding at December 31, 20191,825 $122.46   
Granted (all at market price)433 $158.62 
Exercised(365)$106.04 
Forfeited and canceled(62)$147.83 
Outstanding at December 31, 20201,831 $137.01 6.8$102.3 
Vested and expected to vest at December 31, 20201,777 $136.83 6.8$99.5 
Exercisable at December 31, 2020563 $112.11 7.2$45.5 
The following table summarizes changes in outstanding options and the related weighted-average exercise price per share for the twelve months ended December 31, 2019 and 2018:
 December 31,
 20192018
 SharesWeighted-
Average Price		SharesWeighted-
Average Price
 (In thousands)(In thousands)
Outstanding at the beginning of the year1,462 $103.50 1,184 $87.64 
Granted (all at market price)740 $112.48 553 $122.35 
Exercised(307)$72.45 (212)$60.55 
Forfeited and canceled(70)$123.62 (63)$114.67 
Outstanding at the end of the year1,825 $122.46 1,462 $103.50 
Exercisable at end of year643 $104.95 631 $80.81 
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, 2020, 2019 and 2018 and the related weighted-average grant date fair value:
SharesWeighted-Average
Grant Date
Fair Value
 (In thousands) 
Nonvested at December 31, 20171,011 $109.48 
Granted563 $109.71 
Vested(417)$87.09 
Forfeited(82)$115.40 
Nonvested at December 31, 20181,075 $120.11 
Granted386 $115.68 
Vested(256)$127.17 
Forfeited(164)$119.36 
Nonvested at December 31, 20191,041 $118.25 
Granted257 $155.84 
Vested(279)$157.73 
Forfeited(92)$153.43 
Nonvested at December 31, 2020927 $128.04