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Share-based Compensation Plans (Tables)
3 Months Ended
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Nonvested share activity [Table Text Block]
Nonvested Share Activity - RSUs and DSUs 
  Number of shares 
        
 (in thousands of shares)RSUs DSUs Total 
           
 Balance as of December 31, 2013 396.4   19.2   415.6 
 Granted 128.7   28.3   157.0 
 Cancelled awards (5.6)   -   (5.6) 
 Vested (65.3)   (19.2)   (84.5) 
  Balance as of June 30, 2014 454.2   28.3   482.5 
Performance Shares PSU [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Nonvested share activity [Table Text Block]
Nonvested Share Activity - MSUs and PSUs
  Number of shares 
        
 (in thousands of shares)PSUs MSUs Total 
           
 Balance as of December 31, 2013 199.3   96.2   295.5 
 Granted 186.8   82.9   269.7 
 Cancelled awards (2.7)   -   (2.7) 
  Balance as of June 30, 2014 383.4   179.1   562.5