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Stock-Based Compensation Plans (Details 4) (Restricted Stock Units, USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Restricted Stock Units
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested stock units balance, number of shares 1,799,145 1,628,744  
Granted in 2013, number of shares 924,576 652,120 617,195
Forfeited in 2013, number of shares 82,629    
Vested in 2013, number of shares 792,113 [1]    
Nonvested stock units balance, weighted average grant-date fair value (in dollars per share) $ 40.86 $ 41.10  
Granted in 2013, weighted average grant-date fair value (in dollars per share) $ 39.90    
Forfeited in 2013, weighted average grant-date fair value (in dollars per share) $ 41.38    
Vested in 2013, weighted average grant-date fair value (in dollars per share) $ 40.74    
Dividend equivalents earned during vesting period, in shares 120,567    
[1] Includes dividend equivalents of 120,567 earned during vesting period