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Share-Based Compensation (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-Based Compensation [Abstract]        
Percent of market price (in hundredths) 100.00%      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available to be granted under existing stock plans (in shares) 1,200,000      
Aggregate intrinsic value [Abstract]        
Age participant attains for recognition of expenses from date of grant 65 years      
Grant Date Weighted- Average Fair Value [Abstract]        
Total pre-tax share-based compensation recognized in the Consolidated Statements of Earnings $ 8,400,000 $ 10,100,000 $ 7,800,000  
Tax related benefits 2,600,000 2,400,000 1,200,000  
Cash received from the exercise of stock options 1,000,000 1,500,000 2,600,000  
Range of Exercise Price 1 [Member]
        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Exercise price range, lower range (in dollars per share) $ 18.57      
Exercise price range, upper range (in dollars per share) $ 22.99      
Options outstanding (in shares) 36,000      
Weighted-average remaining contractual life 1 year 7 months 6 days      
Weighted-average exercise price (in dollars per share) $ 19.62      
Options exercisable (in shares) 36,000      
Weighted-average exercise price (in dollars per share) $ 19.62      
Range of Exercise Price 2 [Member]
        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Exercise price range, lower range (in dollars per share)   $ 23.00    
Exercise price range, upper range (in dollars per share)   $ 26.11    
Options outstanding (in shares)   37,000    
Weighted-average remaining contractual life   1 year 8 months 12 days    
Weighted-average exercise price (in dollars per share)   $ 23.50    
Options exercisable (in shares)   37,000    
Weighted-average exercise price (in dollars per share)   $ 23.50    
Range of Exercise Price 3 [Member]
        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Exercise price range, lower range (in dollars per share)     $ 26.12  
Exercise price range, upper range (in dollars per share)     $ 30.07  
Options outstanding (in shares)     20,000  
Weighted-average remaining contractual life     3 years 9 months 18 days  
Weighted-average exercise price (in dollars per share)     $ 28.16  
Options exercisable (in shares)     20,000  
Weighted-average exercise price (in dollars per share)     $ 28.16  
Nonvested Stock [Member]
        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expense recognition period (in years) 5 years      
Aggregate intrinsic value [Abstract]        
Percentage of future grants that will be performance stock unit awards 50.00%      
Number of years to measure performance metrics 2 years      
Nonvested Stock [Roll Forward]        
Outstanding, Beginning (in shares) 339,000 400,000 363,000  
Granted (in shares) 262,000 293,000 270,000  
Vested (in shares) (94,000) (314,000) (175,000)  
Cancelled (in shares) (10,000) (40,000) (58,000)  
Outstanding, Ending (in shares) 497,000 339,000 400,000  
Grant Date Weighted- Average Fair Value [Abstract]        
Outstanding, Beginning (in dollars per share) $ 33.22 $ 31.42 $ 29.20  
Granted (in dollars per share) $ 46.14 $ 36.09 $ 35.48  
Vested (in dollars per share) $ 40.57 $ 33.59 $ 34.04  
Cancelled ( in dollars per share) $ 42.22 $ 33.41 $ 28.45  
Outstanding, Ending Balance (in dollars per share) $ 38.46 $ 33.22 $ 31.42  
Aggregate Intrinsic Value 24,095,000 12,046,000 15,142,000 13,340,000
Total intrinsic values of shares vested 4,400,000 11,200,000 6,200,000  
Stock Options [Member]
        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expense recognition period (in years) 3 years      
Expiration from date of grant (in years) 10 years      
Stock Options [Roll Forward]        
Outstanding, beginning of period (in shares) 141,000 207,000 328,000  
Grants in period (in shares) 0 0 0  
Exercised (in shares) (48,000) (66,000) (121,000)  
Outstanding, end of period (in shares) 93,000 141,000 207,000 328,000
Exercisable, end of period (in shares) 93,000      
Weighted- Average Exercise Price [Abstract]        
Outstanding, beginning of period (in dollars per share) $ 22.35 $ 22.36 $ 22.06  
Exercised (in dollars per share) $ 21.00 $ 22.38 $ 21.55  
Outstanding, end of period (in dollars per share) $ 23.04 $ 22.35 $ 22.36 $ 22.06
Exercisable, end of period (in dollars per share) $ 23.04      
Weighted average remaining life [Abstract]        
Weighted average remaining life 2 years 2 months 12 days 2 years 8 months 12 days 3 years 1 month 6 days 3 years 10 months 24 days
Exercisable, weighted average remaining life 2 years 2 months 12 days      
Aggregate intrinsic value [Abstract]        
Aggregate intrinsic value of stock options, outstanding 2,374,000 1,859,000 3,222,000 4,807,000
Aggregate intrinsic values of stock options exercised 1,100,000 900,000 1,700,000  
Aggregate intrinsic value of stock options, exercisable 2,374,000      
Non vested stock and performance stock units [Member]
        
Grant Date Weighted- Average Fair Value [Abstract]        
Compensation cost net yet recognized $ 11,600,000      
Compensation cost not yet recognized, period for recognition 2 years 4 months 24 days