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Stock-Based Compensation Plans (Tables)
 3 Months Ended
Mar. 31, 2016
Share-based Compensation, Allocation and Classification in Financial Statements [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity
Presented below is a summary of Company stock option activity for the three months ended March 31, 2016. Prior to 2016, all outstanding stock options were fully vested and the related expense had been fully recognized.
 
Shares (in millions)
Shares
 
Weighted
Average
Exercise
Price
 
Weighted Average Remaining Contractual Term (in years)
 
Weighted Average Fair Value at Date of Grant (per share)
Options outstanding at December 31, 2015
0.5

 
$
13.33

 
5.6
 
$
3.78

Options exercisable at December 31, 2015
0.5

 
$
13.33

 
5.6
 
$
3.74

Granted
—

 
—

 
 
 
 
Exercised
(0.1
)
 
13.76

 
 
 
 
Forfeited
—

 
—

 
 
 
 
Options outstanding at March 31, 2016
0.4

 
$
13.31

 
5.3
 
$
3.77

Options exercisable at March 31, 2016
0.4

 
$
13.31

 
5.3
 
$
3.77