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Equity Incentive Program (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Stock-based compensation expense [Abstract]        
Pre-tax stock-based compensation expense $ 3,658,000 $ 4,710,000 $ 10,403,000 $ 16,861,000
Tax benefit (817,000) (1,649,000) $ (2,313,000) $ (5,974,000)
Stock Appreciation Rights (SARs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issued during period (in shares)     757,603  
Risk-free interest rate (in hundredths)       1.80%
Dividend yield (in hundredths)       2.27%
Expected life (in years)       4 years 7 months
Volatility (in hundredths)       21.90%
Grant price (in dollars per share)       $ 66.84
Fair value at date of grant (in dollars per share)       10.65
Share-based Compensation Arrangement by Share-based Payment Award, Other Share Increase (Decrease)     1,138,008  
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Other Share Increase (Decrease)     26,316  
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issued during period (in shares)     122,459  
Fair value at date of grant (in dollars per share)       $ 66.84
Performance share attainment     222.25% 222.49%
Share-based Compensation Arrangement by Share-based Payment Award, Other Share Increase (Decrease)     47,063  
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issued during period (in shares)     284,721  
Minimum [Member] | Stock Appreciation Rights (SARs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Risk-free interest rate (in hundredths)     2.58%  
Dividend yield (in hundredths)     1.99%  
Expected life (in years)     5 years 7 months  
Volatility (in hundredths)     20.95%  
Grant price (in dollars per share)     $ 79.75  
Fair value at date of grant (in dollars per share)     14.58  
Minimum [Member] | Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value at date of grant (in dollars per share)     $ 79.75  
Maximum [Member] | Stock Appreciation Rights (SARs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Risk-free interest rate (in hundredths)     2.87%  
Dividend yield (in hundredths)     2.43%  
Expected life (in years)     5 years 7 months  
Volatility (in hundredths)     21.20%  
Grant price (in dollars per share)     $ 82.08  
Fair value at date of grant (in dollars per share)     15.41  
Maximum [Member] | Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value at date of grant (in dollars per share)     $ 82.08  
Continuing Operations [Member]        
Stock-based compensation expense [Abstract]        
Total stock-based compensation expense, net of tax 2,841,000 3,061,000 $ 8,090,000 $ 10,887,000
Discontinuing Operations [Member]        
Stock-based compensation expense [Abstract]        
Total stock-based compensation expense, net of tax $ 174 $ 608 $ 744 $ 1,261