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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2012
Share-based Compensation [Abstract]  
Schedule of compensation expense under stock based compensation plan
The compensation expense for awards under the plan for the years ended December 31, 2012, 2011 and 2010 is as follows:
 
(In millions)
2012
 
2011
 
2010
Stock-based compensation expense
$
34.0

 
$
26.3

 
$
27.5

Income tax benefits related to stock-based compensation expense
$
11.5

 
$
8.9

 
$
9.4
Summary of changes in nonvested restricted stock awards
A summary of the nonvested restricted stock awards as of December 31, 2012, and changes during the year is presented below:
(Number of restricted stock shares in thousands)
Shares
 
Weighted-Average Grant
Date Fair Value
Nonvested at December 31, 2011
3,847

 
$
22.82

Granted
859

 
$
49.84

Vested
(1,933
)
 
$
13.91

Canceled
(28
)
 
$
35.36

Nonvested at December 31, 2012
2,745

 
$
37.43
Summary of restricted stock activity
The following summarizes values for restricted stock activity for the years ended December 31, 2012, 2011 and 2010:
 
 
2012
 
2011
 
2010
Weighted average grant date fair value of restricted stock awards granted
$
49.84

 
$
40.84

 
$
26.94

Vest date fair value of restricted stock vested (in millions)
$
100.8

 
$
47.3

 
$
54.3
Schedule of stock options activity
The following shows stock option activity for the year ended December 31, 2012:
 
(Number of stock options in thousands, intrinsic value in millions)
Shares
Under
Option
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Term (in years)
 
Aggregate
Intrinsic Value
Outstanding at December 31, 2011
306

 
$
5.06

 
 
 
 
Exercised
(153
)
 
$
4.89

 
 
 
 
Outstanding and exercisable at December 31, 2012
153

 
$
5.24

 
0.6
 
5.7