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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
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)
5.0

Performance-Based RSUs (7 times the number of awards)
14.4

Shares available for issuance
43.1
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):
 
2016
 
2015
 
2014
Stock options
$
—

 
$
—

 
$
0.7

Restricted stock units
63.9

 
29.2

 
29.2

Stock-based compensation
$
63.9

 
$
29.2

 
$
29.9

Stock-based compensation, net of income tax benefit of $30.4 million, $12.9 million and $11.5 million in 2016, 2015 and 2014, respectively
$
33.5

 
$
16.3

 
$
18.4
Summary Of Changes In Stock Options
The following table summarizes the changes in the number of shares of common stock under option for 2016 (shares and aggregate intrinsic value in millions):
 
Shares
 
Weighted-Average Exercise Price Per Share
 
Aggregate    
Intrinsic    
Value
Outstanding at December 31, 2015
1.2

 
$
20

 


Exercised
(0.5
)
 
$
21

 


Outstanding at December 31, 2016
0.7

 
$
20

 
$
17.5

Exercisable at December 31, 2016
0.7

 
$
20

 
$
17.5
Summary Of Changes Of Restricted Stock And Restricted Stock Units
The following table summarizes the changes in the number of outstanding restricted stock units for 2016 (shares in millions):
 
Restricted Stock Units
 
Weighted-Average Grant Date Fair Value Per Share
Outstanding at December 31, 2015
2.9

 
$
34

Granted
2.7

 
$
54

Vested
(1.0
)
 
$
26

Forfeited
(0.3
)
 
$
45

Outstanding at December 31, 2016
4.3

 
$
48

Expected to vest at December 31, 2016
4.0

 
$
48
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, 2016 (in millions):
 
Unrecognized
    Compensation Cost
 
Weighted-Average Period    
of Expense Recognition    
(in years)
Restricted stock units
$
119.1

 
2