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Stock-Based Compensation Programs (Details) (USD $)
1 Months Ended 6 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jun. 30, 2014
Mar. 31, 2014
installment
Stock option and SSARs
       
Stock-Based Compensation Programs        
Number of equal installments commencing one year from the date of grant       4
Vesting period     1 year  
Expiration period of options     10 years  
Granted (in shares) 1,361,390      
Weighted average fair value at grant date (in dollars per share) $ 9.81 $ 8.69    
Weighted average assumptions used in estimation of fair values of options        
Expected dividend yield (as a percent) 1.06% 1.13%    
Expected stock price volatility (as a percent) 21.41% 22.02%    
Risk-free interest rate (as a percent) 1.65% 1.02%    
Expected life of options 5 years 6 months 5 years 6 months    
Granted (in shares) 143,305 148,875    
PCEQs
       
Stock-Based Compensation Programs        
Vesting period     3 years  
PCEQs | Minimum
       
Weighted average assumptions used in estimation of fair values of options        
Vest range of participant's assigned award opportunity (as a percent) 0.00% 0.00%    
PCEQs | Maximum
       
Weighted average assumptions used in estimation of fair values of options        
Vest range of participant's assigned award opportunity (as a percent) 200.00% 200.00%