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Stock-Based Compensation Programs (Details)
1 Months Ended 6 Months Ended 12 Months Ended
Feb. 28, 2015
shares
Jan. 31, 2014
shares
Jun. 30, 2015
installment
$ / shares
Dec. 31, 2014
$ / shares
Stock option and SSARs        
Stock-Based Compensation Programs        
Number of equal installments commencing one year from the date of grant | installment     4  
Vesting period     1 year  
Expiration period of options     10 years  
Granted (in shares) 1,231,865      
Weighted average fair value at grant date (in dollars per share) | $ / shares     $ 14.20 $ 9.81
Weighted average assumptions used in estimation of fair values of options        
Expected dividend yield (as a percent) 0.79% 1.06%    
Expected stock price volatility (as a percent) 22.11% 21.41%    
Risk-free interest rate (as a percent) 1.39% 1.65%    
Expected life of options 5 years 10 months 6 days 5 years 6 months    
PCEQs        
Stock-Based Compensation Programs        
Vesting period     3 years  
Granted (in shares) 116,559 143,305    
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%