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Share-Based Compensation Plans (Details 1) - $ / shares
shares in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Summary of the changes in outstanding stock options    
Outstanding, beginning of period (in shares) 2,989  
Granted (in shares) 708  
Exercised (in shares) (519)  
Forfeited (in shares) (178)  
Outstanding, end of period (in shares) 3,000 2,989
Options exercisable, ending of period (in shares) 1,939  
Vested and expected, end of period (in shares) 2,877  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]    
Outstanding, beginning of period (in usd per share) $ 28.60  
Granted (in usd per share) 35.88  
Exercised (in usd per share) 26.85  
Forfeited (in usd per share) 34.04  
Outstanding, end of period (in usd per share) 30.30 $ 28.60
Options exercisable, end of period (in usd per share) 27.44  
Vested and expected, end of period (in usd per share) $ 30.09  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Remaining Contractual Term [Roll Forward]    
Outstanding, weighted average remaining contractual term 6 years 8 months 6 years 6 months
Granted 10 years  
Exercised 5 years 7 months  
Forfeited and expired 8 years 6 months  
Options exercisable, end of period 5 years 5 months  
Vested and expected to vest, end of period 6 years 7 months