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Equity and Cash Incentive Program (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
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]      
Tax benefit from the exercise of share-based awards $ 14,759 $ 8,365 $ 4,964
Stock-based compensation expense [Abstract]      
Pre-tax compensation expense 23,698 24,073 18,650
Tax benefit (2,722) (8,411) (6,579)
Total stock-based compensation expense, net of tax $ 20,976 $ 15,662 $ 12,071
Shares Granted to Directors [Abstract]      
Aggregate shares granted 15,802 16,231 21,023
Shares deferred (9,917) (11,337) (11,882)
Net shares granted 5,885 4,894 9,141
Stock Appreciation Rights (SARs) [Member]      
Awards Granted, Fair Value Assumptions and Methodology [Abstract]      
Additional awards issued due to modification 1,138,008    
Risk-free interest rate (in hundredths)   1.80% 1.05%
Dividend yield (in hundredths)   2.27% 3.09%
Expected life (in years)   4 years 7 months 6 days 4 years 7 months 6 days
Volatility (in hundredths)   21.90% 26.17%
Grant price $ 81.43 $ 66.85 $ 48.28
Fair value on date of grant   $ 10.65 $ 7.80
Awards Outstanding [Roll Forward]      
Awards Outstanding (in number of shares) 5,329,204 6,573,979  
Awards Granted (in number of shares) 757,603 1,028,116 1,346,354
Surrendered upon spin-off (210,119)    
Modification upon spin-off 1,138,008    
Awards Forfeit and Expired (in number of shares) (438,014)    
Awards Exercised (in number of shares) (2,492,253)    
Awards Exercisable (in number of shares) 2,661,980    
Awards Outstanding, Weighted Average Exercise Price [Roll Forward]      
Awards Outstanding, Weighted Average Exercise Price $ 60.19 $ 62.78  
share-based compensation, grants surrendered upon spin-off, weighted average exercise price 68.36 $ 0  
Awards Forfeit and Expired, Weighted Average Exercise Price 68.76    
Awards Exercised, Weighted Average Exercise Price 47.17    
Awards Exercisable, Weighted Average Exercise Price $ 57.26    
Additional Disclosures [Abstract]      
Awards Outstanding, Weighted Average Remaining Contractual Term 6 years 2 months 12 days    
Awards Exercisable, Weighted Average Remaining Contractual Term 4 years 6 months    
Fair value of stock appreciation rights which became exerciable during the year $ 12,832 $ 16,006 $ 24,843
Awards Exercised, Total Intrinsic Value 101,365 $ 44,646 $ 34,916
Unrecognized Compensation Cost [Abstract]      
Unrecognized Compensation Expense $ 8,315    
Unrecognized Compensation Expense, Period for Recognition 1 year 9 months 18 days    
Performance Shares [Member]      
Awards Granted, Fair Value Assumptions and Methodology [Abstract]      
Additional awards issued due to modification 26,316    
Grant price $ 80.30    
Fair value on date of grant   $ 66.85 $ 48.28
Awards Outstanding [Roll Forward]      
Surrendered upon spin-off (10,683)    
Modification upon spin-off 26,316    
Awards Outstanding, Weighted Average Exercise Price [Roll Forward]      
share-based compensation, grants surrendered upon spin-off, weighted average exercise price $ 67.39    
Awards Forfeit and Expired, Weighted Average Exercise Price $ 67.88    
Unvested Awards [Roll Forward]      
Awards Unvested (in number of shares) 144,957 124,467  
Awards Granted (in number of shares) 122,459 57,958 79,561
Awards Forfeit (in number of shares) (57,015)    
Awards Vested (in number of shares) (60,587)    
Unvested Awards, Weighted Average Grant Date Fair Value [Roll Forward]      
share-based compensation, additional grants due to modification, weighted average exercise price $ 0    
Awards Unvested, Weighted Average Grant Date Fair Value 76.99 $ 65.80  
Awards Vested, Weighted Average Grant Date Fair Value $ 48.27    
Unrecognized Compensation Cost [Abstract]      
Unrecognized Compensation Expense $ 21,603    
Unrecognized Compensation Expense, Period for Recognition 1 year 10 months 24 days    
Shares Granted to Directors [Abstract]      
Performance Share Attainment 285.39% 280.00% 34.61%
Restricted Stock Units (RSUs) [Member]      
Awards Granted, Fair Value Assumptions and Methodology [Abstract]      
Additional awards issued due to modification 47,063    
Fair value on date of grant $ 80.59    
Awards Outstanding [Roll Forward]      
Surrendered upon spin-off (26,762)    
Modification upon spin-off 47,063    
Awards Outstanding, Weighted Average Exercise Price [Roll Forward]      
share-based compensation, grants surrendered upon spin-off, weighted average exercise price $ 70.21    
Unvested Awards [Roll Forward]      
Awards Unvested (in number of shares) 390,481 333,886  
Awards Granted (in number of shares) 284,721 174,203 249,263
Awards Forfeit (in number of shares) (58,436)    
Awards Vested (in number of shares) (189,991)    
Unvested Awards, Weighted Average Grant Date Fair Value [Roll Forward]      
share-based compensation, additional grants due to modification, weighted average exercise price $ 0    
Awards Unvested, Weighted Average Grant Date Fair Value 73.35 $ 70.06  
Awards Forfeit, Weighted Average Grant Date Fair Value 69.66    
Awards Vested, Weighted Average Grant Date Fair Value $ 70.06    
Unrecognized Compensation Cost [Abstract]      
Unrecognized Compensation Expense $ 18,987    
Unrecognized Compensation Expense, Period for Recognition 1 year 10 months 24 days    
Additional Paid-in Capital [Member]      
Additional Disclosures [Abstract]      
Tax benefit from the exercise of share-based awards     $ 4,964
Minimum [Member] | Stock Appreciation Rights (SARs) [Member]      
Awards Granted, Fair Value Assumptions and Methodology [Abstract]      
Risk-free interest rate (in hundredths) 2.58%    
Dividend yield (in hundredths) 1.99%    
Expected life (in years) 5 years 7 months 6 days    
Volatility (in hundredths) 20.95%    
Grant price $ 79.75    
Fair value on date of grant 14.58    
Minimum [Member] | Performance Shares [Member]      
Awards Granted, Fair Value Assumptions and Methodology [Abstract]      
Fair value on date of grant $ 79.75    
Maximum [Member] | Stock Appreciation Rights (SARs) [Member]      
Awards Granted, Fair Value Assumptions and Methodology [Abstract]      
Risk-free interest rate (in hundredths) 2.87%    
Dividend yield (in hundredths) 2.43%    
Expected life (in years) 5 years 8 months 12 days    
Volatility (in hundredths) 21.20%    
Grant price $ 82.09    
Fair value on date of grant 15.41    
Maximum [Member] | Performance Shares [Member]      
Awards Granted, Fair Value Assumptions and Methodology [Abstract]      
Fair value on date of grant $ 82.09    
Discontinued Operations [Member]      
Stock-based compensation expense [Abstract]      
Pre-tax compensation expense $ 744 $ 2,454 $ 2,366