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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2014
Share-based Compensation [Abstract]  
2013 Stock Plan [Table Text Block]
The following table depicts the number of shares authorized for issuance and available under the 2013 Plan (shares in millions):
 
2013 Plan
Authorized for issuance
62.5

Effects of:
 
Restricted stock units and Stock Price Based RSUs (3½ times the number of awards)
1.2

TSR Performance-Based RSUs (7 times the number of awards)
7.6

Shares available for issuance
53.7
Share-based Compensation Expense Recognized [Table Text Block]
The table below summarizes the expense related to share-based payments for the years ended December 31, (in millions):
 
2014
 
2013
 
2012
Stock options
$
0.7

 
$
1.1

 
$
4.3

Restricted stock and restricted stock units
29.2

 
36.1

 
28.6

Stock-based compensation
$
29.9

 
$
37.2

 
$
32.9

Stock-based compensation, net of income tax benefit of $11.5 million, $13.3 million and $11.7 million in 2014, 2013 and 2012, respectively
$
18.4

 
$
23.9

 
$
21.2
Summary Of Changes In Stock Options
The following table summarizes the changes in the number of shares of common stock under option for 2014 (shares and aggregate intrinsic value in millions):
 
Shares
Weighted-Average Exercise Price
Aggregate    
Intrinsic    
Value
Outstanding at December 31, 2013
5.9

$
22



Exercised
(3.1
)
$
24



Forfeited/expired
(0.2
)
$
27

 
Outstanding at December 31, 2014
2.6

$
19

$
49.1

Exercisable at December 31, 2014
2.6

$
19

$
49.1
Summary Of Changes Of Restricted Stock And Restricted Stock Units
The following table summarizes the changes in the number of shares of restricted stock, restricted stock units and performance-based restricted stock units for 2014 (shares in millions):
 
Shares
 
Weighted-Average Grant Date Fair Value
Outstanding at December 31, 2013
4.2

 
$
22

Granted
1.3

 
$
33

Vested
(1.2
)
 
$
21

Forfeited
(0.6
)
 
$
25

Outstanding at December 31, 2014
3.7

 
$
26

Expected to vest at December 31, 2014
3.6

 
$
25
Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block]
The following table summarizes the Company’s total unrecognized compensation cost related to stock-based compensation as of December 31, 2014 (in millions):
 
Unrecognized
    Compensation Cost
 
Weighted-Average Period    
of Expense Recognition    
(in years)
Restricted stock units
$
42.0

 
2