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Stock-Based Compensation Plans Schedule of Non-Vested Restricted Stock Units Activity (Tables)
 12 Months Ended
Dec. 31, 2015
Performance Based Restricted Stock [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
Changes to non-vested performance-based restricted stock units for the years ended December 31, 2015, 2014 and 2013 were as follows:
Shares (in millions)
Number
of
Shares
Weighted
Average Fair
Value at Date
of Grant
Non-vested at December 31, 2012
1.0

$
12.69

Granted
0.1

16.34

Vested
(0.8
)
13.32

Forfeited
—

—

Non-vested at December 31, 2013
0.3

12.90

Granted
—

—

Vested
(0.3
)
12.90

Forfeited
—

—

Non-vested at December 31, 2014
—

—

Granted
0.3

21.84

Vested
—

—

Forfeited
—

—

Non-vested at December 31, 2015
0.3

$
21.84
Time-Based Restricted Stock [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
Changes to non-vested time-based restricted stock units for the years ended December 31, 2015 and 2014 were as follows:

Shares (in millions)
Number
of
Shares
Weighted
Average Fair
Value at Date
of Grant
Non-vested at December 31, 2012
1.6

$
13.04

Granted
0.6

16.35

Vested
(0.7
)
12.75

Forfeited
(0.1
)
14.09

Non-vested at December 31, 2013
1.4

14.62

Granted
0.7

20.55

Vested
(0.6
)
14.33

Forfeited
(0.2
)
18.85

Non-vested at December 31, 2014
1.3

17.66

Granted
0.7

22.41

Vested
(0.5
)
16.53

Forfeited
(0.2
)
20.78

Non-vested at December 31, 2015
1.3

$
20.20