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Stock Based Compensation Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
 
 
 
 Weighted-
 
Number of
 
 Average Exercise
 
Shares
 
Price Per Share
 
(in millions, except per share data)
Outstanding at January 1, 2013
3.0

 
$
27.08

Options granted
—

 
—

Options exercised
(0.1
)
 
10.59

Options canceled
(0.9
)
 
24.28

Outstanding at December 31, 2013
2.0

 
$
29.22

Options granted
—

 
—

Options exercised
(0.1
)
 
13.87

Options canceled
(1.0
)
 
37.70

Outstanding at December 31, 2014
0.9

 
$
20.66

Options granted
—

 
—

Options exercised
(0.1
)
 
17.13

Options canceled
(0.2
)
 
26.65

Outstanding at December 31, 2015
0.6

 
$
18.58

 
 
 
 
Exercisable at December 31, 2013
2.0

 
$
29.22

Exercisable at December 31, 2014
0.9

 
$
20.66

Exercisable at December 31, 2015
0.6

 
$
18.58
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
 
 
Stock Options
 
Weighted-
 
Weighted-
Range of
 
Outstanding and
 
Average Exercise
 
Average
Exercise Prices
 
Exercisable
 
Price Per Share
 
Contractual Life
 
 
(in millions, except per share data)
 
 
(in years)
$9.19 - $10.08
 
0.2

 
$
9.43

 
2.6
$15.58 - $26.02
 
0.4

 
21.47

 
0.8
 
 
0.6

 
$
18.58

 
1.2
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
 
 
 
Weighted-Average
 
Number of
 
Grant Date Fair
 
Shares/Units
 
Value per Share/Unit
 
(in millions, except per share data)
Outstanding at January 1, 2013
1.1

 
$
11.08

    Granted
0.9

 
12.79

    Vested
(0.7
)
 
11.06

    Canceled
—

 
—

Outstanding at December 31, 2013
1.3

 
$
12.24

    Granted
0.5

 
19.58

    Vested
(0.1
)
 
13.95

    Canceled
(0.1
)
 
12.76

Outstanding at December 31, 2014
1.6

 
$
14.54

    Granted
0.5

 
25.21

    Vested
(0.3
)
 
11.03

    Canceled
(0.1
)
 
19.99

Outstanding at December 31, 2015
1.7

 
$
18.19
Share-based Compensation, Performance Shares Award Outstanding Activity [Table Text Block]
The following table summarizes activity relating to our performance shares:
 
 
 
Weighted Average
 
Number of
 
Grant Date Fair
 
Shares
 
Value per Share
EBITDA Awards
(in millions, except per share data)
Outstanding at January 1, 2014
—

 
$
—

    Granted
0.2

 
27.66

    Vested
—

 
—

    Canceled
—

 
—

Outstanding at December 31, 2014
0.2

 
$
27.66

    Granted
0.1

 
37.68

    Vested
—

 
—

    Canceled
—

 
—

Outstanding at December 31, 2015
0.3

 
$
32.27

 
 
 
 
TSR Awards
 
 
 
Outstanding at January 1, 2014
—

 
$
—

    Granted
0.2

 
21.11

    Vested
—

 
—

    Canceled
—

 
—

Outstanding at December 31, 2014
0.2

 
$
21.11

    Granted
0.1

 
31.22

    Vested
—

 
—

    Canceled
—

 
—

Outstanding at December 31, 2015
0.3

 
$
25.77