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Equity and Cash Incentive Program (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Document Fiscal Year Focus 2017    
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options $ 8,365    
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   $ 4,964 $ 661
Stock-based compensation expense [Abstract]      
Pre-tax compensation expense $ 26,528 21,015 30,697
Tax benefit (9,261) (7,399) (10,877)
Total stock-based compensation expense, net of tax $ 17,267 $ 13,616 $ 19,820
Shares Granted to Directors [Abstract]      
Aggregate shares granted 16,231 21,023 21,205
Shares deferred (11,337) (11,882) (11,196)
Net shares granted 4,894 9,141 10,009
Stock Appreciation Rights (SARs) [Member]      
Awards Granted, Fair Value Assumptions and Methodology [Abstract]      
Risk-free interest rate (in hundredths) 1.80% 1.05% 1.51%
Dividend yield (in hundredths) 2.27% 3.09% 2.24%
Expected life (in years) 4 years 7 months 4 years 7 months 5 years 1 month
Volatility (in hundredths) 21.90% 26.17% 27.19%
Fair value on date of grant $ 12.63 $ 9.25 $ 14.55
Awards Outstanding [Roll Forward]      
Awards Outstanding (in number of shares) 6,573,979 7,253,827  
Awards Granted (in number of shares) 1,028,116 1,346,354 1,144,529
Awards Forfeit and Expired (in number of shares) (240,859)    
Awards Exercised (in number of shares) (1,467,105)    
Awards Exercisable (in number of shares) 3,640,841    
Awards Outstanding, Weighted Average Exercise Price [Roll Forward]      
Awards Outstanding, Weighted Average Exercise Price $ 62.78 $ 59.00  
Awards Granted, Weighted Average Exercise Price 79.28 $ 57.25 $ 73.28
Awards Forfeit and Expired, Weighted Average Exercise Price 69.36    
Awards Exercised, Weighted Average Exercise Price 54.54    
Awards Exercisable, Weighted Average Exercise Price $ 57.65    
Additional Disclosures [Abstract]      
Awards Outstanding, Weighted Average Remaining Contractual Term 5 years 9 months 18 days    
Awards Exercisable, Weighted Average Remaining Contractual Term 4 years    
Fair value of stock appreciation rights which became exerciable during the year $ 16,006 $ 24,843 $ 25,380
Awards Exercised, Total Intrinsic Value 44,646 34,916 14,560
Unrecognized Compensation Cost [Abstract]      
Unrecognized Compensation Expense $ 8,428    
Unrecognized Compensation Expense, Period for Recognition 1 year 7 months 6 days    
Stock Options [Member]      
Additional Disclosures [Abstract]      
Awards Exercised, Total Intrinsic Value $ 0 0 1,649
Cash received for the exercise of stock options $ 0 $ 0 $ 1,468
Performance Shares [Member]      
Awards Granted, Fair Value Assumptions and Methodology [Abstract]      
Fair value on date of grant $ 79.28 $ 57.25 $ 73.28
Unvested Awards [Roll Forward]      
Awards Unvested (in number of shares) 124,467 122,166  
Awards Granted (in number of shares) 57,958 79,561 61,611
Awards Forfeit (in number of shares) (6,123)    
Awards Vested (in number of shares) (49,534)    
Unvested Awards, Weighted Average Grant Date Fair Value [Roll Forward]      
Awards Unvested, Weighted Average Grant Date Fair Value $ 65.80 $ 65.29  
Awards Forfeit, Weighted Average Grant Date Fair Value 69.41    
Awards Vested, Weighted Average Grant Date Fair Value $ 73.28    
Unrecognized Compensation Cost [Abstract]      
Unrecognized Compensation Expense $ 3,270    
Unrecognized Compensation Expense, Period for Recognition 1 year 10 months 24 days    
Performance Share Attainment 147.81% 20.99% 3.33%
Restricted Stock Units (RSUs) [Member]      
Awards Granted, Fair Value Assumptions and Methodology [Abstract]      
Fair value on date of grant $ 79.28    
Unvested Awards [Roll Forward]      
Awards Unvested (in number of shares) 333,886 336,546  
Awards Granted (in number of shares) 174,203 249,263 145,545
Awards Forfeit (in number of shares) (27,590)    
Awards Vested (in number of shares) (149,273)    
Unvested Awards, Weighted Average Grant Date Fair Value [Roll Forward]      
Awards Unvested, Weighted Average Grant Date Fair Value $ 70.06 $ 64.74  
Awards Forfeit, Weighted Average Grant Date Fair Value 71.16    
Awards Vested, Weighted Average Grant Date Fair Value $ 69.01    
Unrecognized Compensation Cost [Abstract]      
Unrecognized Compensation Expense $ 12,416    
Unrecognized Compensation Expense, Period for Recognition 1 year 7 months 6 days    
Additional Paid-in Capital [Member]      
Additional Disclosures [Abstract]      
Tax benefit from the exercise of share-based awards   $ 4,964 $ 661