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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
Share-based Compensation [Abstract]  
Schedule of compensation expense under stock based compensation plan
The compensation expense for awards under the plan is as follows: 
 
Year Ended December 31,
(In millions)
2015
 
2014
 
2013
Stock-based compensation expense
$
49.4

 
$
44.9

 
$
47.7

Income tax benefits related to stock-based compensation expense
$
16.8

 
$
14.5

 
$
16.2
Schedule of unrecognized compensation cost, nonvested awards
As of December 31, 2015, the portion of stock-based compensation expense related to outstanding awards to be recognized in future periods is as follows:
 
 
December 31, 2015
Stock-based compensation expense not yet recognized (in millions)
 
$
49.4

Weighted-average recognition period (in years)
 
1.7
Summary of changes in nonvested restricted stock awards
A summary of the nonvested restricted stock units to employees as of December 31, 2015, and changes during the year is presented below:
(Shares in thousands)
Shares
 
Weighted-Average Grant
Date Fair Value
Nonvested at December 31, 2014
2,554

 
$
51.46

Granted
1,521

 
$
39.36

Vested
(574
)
 
$
50.94

Cancelled/forfeited
(226
)
 
$
47.07

Nonvested at December 31, 2015
3,275

 
$
46.11
Summary of restricted stock activity
The following summarizes values for restricted stock unit activity to employees:
 
Year Ended December 31,
 
2015
 
2014
 
2013
Weighted average grant date fair value of restricted stock units granted
$
39.36

 
$
51.20

 
$
53.01

Vest date fair value of restricted stock units vested (in millions)
$
25.5

 
$
39.1

 
$
51.5