Annual report pursuant to Section 13 and 15(d)

STOCK-BASED COMPENSATION (Tables)

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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
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