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Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
The following table summarizes activity relating to our RSUs:
 
 
 
Weighted-Average
 
Number of
 
Grant Date Fair
 
Shares/Units
 
Value per Share/Unit
 
(in millions, except per share data)
Outstanding at January 1, 2016
1.7

 
$
18.19

    Granted
0.9

 
15.41

    Vested
(0.7
)
 
13.23

    Canceled
(0.1
)
 
18.75

Outstanding at December 31, 2016
1.8

 
$
18.70

    Granted
1.3

 
18.09

    Vested
(0.4
)
 
19.70

    Canceled
(0.2
)
 
16.79

Outstanding at December 31, 2017
2.5

 
$
18.35

    Granted
1.7

 
14.57

    Vested
(0.4
)
 
24.16

    Canceled
(0.3
)
 
15.84

Outstanding at December 31, 2018
3.5

 
$
16.00
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, 2016
0.3

 
$
32.27

    Granted
0.2

 
28.04

    Vested
—

 
—

    Canceled
—

 
—

Outstanding at December 31, 2016
0.5

 
$
30.19

    Granted
0.2

 
39.01

    Vested
(0.1
)
 
27.73

    Canceled
—

 
—

Outstanding at December 31, 2017
0.6

 
$
33.91

    Granted
—

 
—

    Vested
(0.1
)
 
37.67

    Canceled
—

 
—

Outstanding at December 31, 2018
0.5

 
$
34.49

 
 
 
 
TSR Awards
 
 
 
Outstanding at January 1, 2016
0.3

 
$
25.77

    Granted
0.2

 
13.16

    Vested
—

 
—

    Canceled
—

 
—

Outstanding at December 31, 2016
0.5

 
$
19.55

    Granted
0.2

 
24.58

    Vested
(0.1
)
 
22.78

    Canceled
—

 
—

Outstanding at December 31, 2017
0.6

 
$
20.93

    Granted
0.3

 
13.91

    Vested
(0.1
)
 
31.21

    Canceled
—

 
—

Outstanding at December 31, 2018
0.8

 
$
16.25

 
 
 
 
Free Cash Flow Awards
 
 
 
Outstanding at January 1, 2018
—

 
$
—

    Granted
0.3

 
14.28

    Vested
—

 
—

    Canceled
—

 
—

Outstanding at December 31, 2018
0.3

 
$
14.28