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Equity and Cash Incentive Program (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Document Fiscal Year Focus 2015    
Awards Granted, Fair Value Assumptions and Methodology [Abstract]      
Shares available for grant 17,000,000    
Vesting period (in years) 3 years    
Award term 10 years    
Additional Disclosures [Abstract]      
Cash received for the exercise of stock options $ 1,468 $ 5,227 $ 14,830
Tax benefit from the exercise of stock options $ 661 15,110 25,661
Unrecognized Compensation Cost [Abstract]      
Document Period End Date Dec. 31, 2015    
Stock-based compensation expense [Abstract]      
Pre-tax compensation expense $ 30,697 31,628 30,480
Tax benefit (10,877) (11,201) (10,745)
Total stock-based compensation expense, net of tax $ 19,820 $ 20,427 $ 19,735
Shares Granted to Directors [Abstract]      
Aggregate shares granted 21,205 17,331 14,271
Shares deferred (11,196) (8,904) (6,929)
Shares withheld to satisfy tax obligations 0 (210) (354)
Net shares granted 10,009 8,217 6,988
Stock Appreciation Rights (SARs) [Member]      
Awards Granted, Fair Value Assumptions and Methodology [Abstract]      
Risk-free interest rate (in hundredths) 1.51% 1.70% 1.39%
Dividend yield (in hundredths) 2.24% 1.98% 2.06%
Expected life (in years) 5 years 1 month 5 years 4 months 7 years 1 month
Volatility (in hundredths) 27.19% 30.81% 33.78%
Fair value on date of grant $ 14.55 $ 19.84 $ 18.17
Awards Outstanding [Roll Forward]      
Awards Outstanding (in number of shares) 7,810,593 7,640,742  
Awards Modified upon spin-off (in number of shares)   933,845  
Awards Granted (in number of shares) 1,144,529 1,043,734 1,613,884
Awards Forfeit and Expired (in number of shares) (299,349)    
Awards Exercised (in number of shares) (675,329)    
Awards Exercisable (in number of shares) 4,482,264    
Awards Outstanding, Weighted Average Exercise Price [Roll Forward]      
Awards Outstanding, Weighted Average Exercise Price $ 57.32 $ 54.69  
Awards Granted, Weighted Average Exercise Price 73.28 $ 82.51 $ 63.33
Awards Forfeit and Expired, Weighted Average Exercise Price 70.91    
Awards Exercised, Weighted Average Exercise Price 48.61    
Awards Exercisable, Weighted Average Exercise Price $ 46.67    
Additional Disclosures [Abstract]      
Awards Outstanding, Weighted Average Remaining Contractual Term 5 years 10 months 24 days    
Awards Exercisable, Weighted Average Remaining Contractual Term 4 years 4 months 24 days    
Fair value of stock appreciation rights which became exerciable during the year $ 25,380 $ 26,796 $ 23,605
Awards Exercised, Total Intrinsic Value 14,560 $ 51,813 83,944
Unrecognized Compensation Cost [Abstract]      
Unrecognized Compensation Expense $ 13,178    
Unrecognized Compensation Expense, Period for Recognition 1 year 7 months 6 days    
Stock Options [Member]      
Awards Outstanding [Roll Forward]      
Awards Outstanding (in number of shares) 0 52,907  
Awards Modified upon spin-off (in number of shares)   20,523  
Awards Granted (in number of shares) 0    
Awards Forfeit and Expired (in number of shares) (9,081)    
Awards Exercised (in number of shares) (43,826)    
Awards Exercisable (in number of shares) 0    
Awards Outstanding, Weighted Average Exercise Price [Roll Forward]      
Awards Outstanding, Weighted Average Exercise Price $ 0.00 $ 33.50  
Awards Granted, Weighted Average Exercise Price 0    
Awards Forfeit and Expired, Weighted Average Exercise Price 33.49    
Awards Exercised, Weighted Average Exercise Price 33.50    
Awards Exercisable, Weighted Average Exercise Price $ 0.00    
Additional Disclosures [Abstract]      
Awards Exercised, Total Intrinsic Value $ 1,649 $ 8,614 $ 19,937
Performance Shares [Member]      
Awards Granted, Fair Value Assumptions and Methodology [Abstract]      
Risk-free interest rate (in hundredths)     0.40%
Dividend yield (in hundredths)     2.06%
Expected life (in years)     2 years 11 months
Volatility (in hundredths)     30.36%
Fair value on date of grant $ 73.28 $ 82.51 $ 70.92
Awards Outstanding [Roll Forward]      
Awards Modified upon spin-off (in number of shares)   11,480  
Unvested Awards [Roll Forward]      
Awards Unvested (in number of shares) 116,060 101,723  
Awards Granted (in number of shares) 61,611 58,206 47,032
Awards Forfeit (in number of shares) (4,690)    
Awards Vested (in number of shares) (42,584)    
Unvested Awards, Weighted Average Grant Date Fair Value [Roll Forward]      
Awards Unvested, Weighted Average Grant Date Fair Value $ 77.61 $ 77.33  
Awards Forfeit, Weighted Average Grant Date Fair Value 75.49    
Awards Vested, Weighted Average Grant Date Fair Value $ 70.92    
Unrecognized Compensation Cost [Abstract]      
Unrecognized Compensation Expense $ 924    
Unrecognized Compensation Expense, Period for Recognition 1 year 4 months 24 days    
Performance Share Attainment 73.00%    
Performance Share Attainment 11.98% 34.33%  
Restricted Stock Units (RSUs) [Member]      
Awards Granted, Fair Value Assumptions and Methodology [Abstract]      
Fair value on date of grant $ 73.28    
Awards Outstanding [Roll Forward]      
Awards Modified upon spin-off (in number of shares)   5,389  
Unvested Awards [Roll Forward]      
Awards Unvested (in number of shares) 254,572 166,000  
Awards Granted (in number of shares) 145,545 131,719 0
Awards Forfeit (in number of shares) (17,597)    
Awards Vested (in number of shares) (39,376)    
Unvested Awards, Weighted Average Grant Date Fair Value [Roll Forward]      
Awards Unvested, Weighted Average Grant Date Fair Value $ 75.07 $ 76.00  
Awards Forfeit, Weighted Average Grant Date Fair Value 77.67    
Awards Vested, Weighted Average Grant Date Fair Value $ 82.15    
Unrecognized Compensation Cost [Abstract]      
Unrecognized Compensation Expense $ 7,722    
Unrecognized Compensation Expense, Period for Recognition 1 year 3 months 18 days    
Additional Paid-in Capital [Member]      
Additional Disclosures [Abstract]      
Tax benefit from the exercise of stock options $ 661 $ 15,110 $ 25,661
Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Share Award Target 0.00%    
Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Share Award Target 200.00%