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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Total Stock-Based Compensation Expense
Total stock-based compensation expense in our Consolidated Statements of Income during the twelve months ended December 31, 2016, 2015 and 2014, was as follows:
 
 
Twelve Months Ended December 31,
 
 
2016
 
2015
 
2014
 
 
(In millions)
Cost of services
 
$
4.5

 
$
5.0

 
$
4.6

Selling, general and administrative expenses
 
32.6

 
33.4

 
33.5

Stock-based compensation expense, before income taxes
 
$
37.1

 
$
38.4

 
$
38.1
Assumptions Used to Estimate Fair Value of Stock Options Granted
The fair value for stock options granted during the twelve months ended December 31, 2016, 2015 and 2014, was estimated at the date of grant, using the binomial model with the following weighted-average assumptions:
 
Twelve Months Ended December 31,
 
2016
 
2015
 
2014
Dividend yield
1.2
%
 
1.2
%
 
1.4
%
Expected volatility
19.4
%
 
21.2
%
 
21.1
%
Risk-free interest rate
1.2
%
 
1.3
%
 
1.6
%
Expected term (in years)
4.8

 
4.8

 
4.8

Weighted-average fair value of stock options granted
$
20.62

 
$
16.75

 
$
12.63
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, 2016, as well as stock options that are vested and expected to vest and stock options exercisable at December 31, 2016: 
 
Shares
 
Weighted-Average Exercise Price
 
Weighted-Average Remaining Contractual Term
 
Aggregate Intrinsic Value
 
(In thousands)
 
 
 
(In years)
 
(In millions)
Outstanding at December 31, 2015
1,866

 
$
49.54

 
 
 
 

Granted (all at market price)
181

 
$
131.41

 

 


Exercised
(779
)
 
$
40.61

 

 


Forfeited and canceled
(40
)
 
$
72.06

 

 


Outstanding at December 31, 2016
1,228

 
$
66.81

 
7.0
 
$
65.6

Vested and expected to vest at December 31, 2016
1,177

 
$
65.25

 
6.9
 
$
64.5

Exercisable at December 31, 2016
856

 
$
48.43

 
5.8
 
$
59.8

The following table summarizes changes in outstanding options and the related weighted-average exercise price per share for the twelve months ended December 31, 2015 and 2014:
 
December 31,
 
2015
 
2014
 
Shares
 
Weighted-
Average Price
 
Shares
 
Weighted-
Average Price
 
(In thousands)
 
 
 
(In thousands)
 
 
Outstanding at the beginning of the year
2,579

 
$
42.54

 
3,530

 
$
37.85

Granted (all at market price)
189

 
$
97.21

 
249

 
$
73.46

Exercised
(888
)
 
$
38.74

 
(1,145
)
 
$
34.81

Forfeited and canceled
(14
)
 
$
58.24

 
(55
)
 
$
49.12

Outstanding at the end of the year
1,866

 
$
49.54

 
2,579

 
$
42.54

Exercisable at end of year
1,411

 
$
39.90

 
1,970

 
$
36.39
Summary of Changes in Nonvested Stock and Weighted-Average Grant Date Fair Value
The following table summarizes changes in our nonvested stock during the twelve months ended December 31, 2016, 2015 and 2014 and the related weighted-average grant date fair value:
 
Shares
 
Weighted-Average
Grant Date
Fair Value
 
(In thousands)
 
 

Nonvested at December 31, 2013
1,695

 
$
46.50

Granted
580

 
$
70.89

Vested
(480
)
 
$
35.83

Forfeited
(95
)
 
$
52.16

Nonvested at December 31, 2014
1,700

 
$
57.52

Granted
472

 
$
79.26

Vested
(698
)
 
$
39.21

Forfeited
(43
)
 
$
59.05

Nonvested at December 31, 2015
1,431

 
$
72.64

Granted
460

 
$
84.07

Vested
(645
)
 
$
55.28

Forfeited
(59
)
 
$
73.54

Nonvested at December 31, 2016
1,187

 
$
87.54