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STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2021

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, 2021, 2020 and 2019, was as follows:

						Twelve Months Ended December 31,
						2021						2020						2019
						(In millions)
Cost of services						$	12.0					$	11.2					$	10.7
Selling, general and administrative expenses						42.9						43.5						39.0
Stock-based compensation expense, before income taxes						$	54.9					$	54.7					$	49.7

Assumptions Used to Estimate Fair Value of Stock Options Granted

The fair value for stock options granted during the twelve months ended December 31, 2021, 2020 and 2019, was estimated at the date of grant, using the binomial model with the following weighted-average assumptions:

			Twelve Months Ended December 31,
			2021						2020						2019
Dividend yield			1.0		%				1.3		%				1.3		%
Expected volatility			28.5		%				23.5		%				23.0		%
Risk-free interest rate			0.5		%				1.3		%				2.4		%
Expected term (in years)			4.8						4.4						4.7
Weighted-average fair value of stock options granted			$	39.63					$	24.29					$	14.97

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, 2021, as well as stock options that are vested and expected to vest and stock options exercisable at December 31, 2021: 

			Shares						Weighted-Average Exercise Price						Weighted-Average Remaining Contractual Term						Aggregate Intrinsic Value
			(In thousands)												(In years)						(In millions)
Outstanding at December 31, 2020			1,831						$	137.01
Granted (all at market price)			314						$	184.03
Exercised			(341)						$	114.35
Forfeited and canceled			(94)						$	145.92
Outstanding at December 31, 2021			1,710						$	149.67					5.3						$	240.9
Vested and expected to vest at December 31, 2021			1,690						$	149.36					5.3						$	238.6
Exercisable at December 31, 2021			522						$	129.57					5.7						$	84.1

The following table summarizes changes in outstanding options and the related weighted-average exercise price per share for the twelve months ended December 31, 2020 and 2019:

			December 31,
			2020												2019
			Shares						Weighted- Average Price						Shares						Weighted- Average Price
			(In thousands)												(In thousands)
Outstanding at the beginning of the year			1,825						$	122.46					1,462						$	103.50
Granted (all at market price)			433						$	158.62					740						$	112.48
Exercised			(365)						$	106.04					(307)						$	72.45
Forfeited and canceled			(62)						$	147.83					(70)						$	123.62
Outstanding at the end of the year			1,831						$	137.01					1,825						$	122.46
Exercisable at end of year			563						$	112.11					643						$	104.95

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, 2021, 2020 and 2019 and the related weighted-average grant date fair value:

			Shares						Weighted-Average Grant Date Fair Value
			(In thousands)
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
Granted			257						$	155.84
Vested			(279)						$	157.73
Forfeited			(92)						$	153.43
Nonvested at December 31, 2020			927						$	128.04
Granted			396						$	175.51
Vested			(465)						$	130.96
Forfeited			(79)						$	141.73
Nonvested at December 31, 2021			779						$	159.73

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