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Stock-Based Compensation Plans Schedule of Nonvested Restricted Stock Units Activity (Tables)
 3 Months Ended
Mar. 31, 2014
Time-Based Restricted Stock [Member]
  
Schedule of Nonvested Restricted Stock Units Activity [Abstract]  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
Changes to non-vested time-based restricted stock and restricted stock units for the three months ended March 31, 2014 were as follows:
    
Shares in Millions Except Per Share Amounts
Number of
Shares
 
Weighted
Average Fair
Value at Date
of Grant
Non-vested at December 31, 2013
1.4

 
$
14.62

Granted
0.6

 
20.03

Vested
(0.6
)
 
13.98

Forfeited
—

 
—

Non-vested at March 31, 2014
1.4

 
$
17.09
Performance Shares [Member]
  
Schedule of Nonvested Restricted Stock Units Activity [Abstract]  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
Changes to non-vested performance-based restricted stock and restricted stock units for the three months ended March 31, 2014 were as follows:
     
Shares in Millions Except Per Share Amounts
Number of
Shares
 
Weighted
Average Fair
Value at Date
of Grant
Non-vested at December 31, 2013
0.3

 
$
12.90

Granted
—

 
—

Vested
(0.3
)
 
12.90

Forfeited
—

 
—

Non-vested at March 31, 2014
—

 
$
—