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Stock Compensation Plans (Details) (USD $)
1 Months Ended 12 Months Ended
Jan. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Share-based Compensation Costs, Including Costs That May Be Recognized As Future Expense [Abstract]          
Unrecognized compensation cost of unvested awards, for future periods $ 12,400,000        
Deferred Compensation Plan [Abstract]          
Recorded obligation for liability awards under deferred compensation plan   87,000 1,300,000    
Compensation cost of liability awards recorded as an expense (benefit)   530,000 760,000 1,900,000  
Additional Compensation Accrued for Certain Senior Executive Related to 2011 True-Up Plan   40,000,000      
Stock Options [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options awarded that vest annually   one-seventh      
Expiration period (in years)   3 years      
Stock options vesting period - tier two   2 years      
Stock option expiration period - tier two (in days)   45 days      
Vesting period (in years)   7 years      
Share-based Compensation Arragngement by Share-based Payment Award, Options, Outstanding, Number of Options [Abstract]          
Number of options outstanding shares beginning balance (in shares) 1,890,786 2,621,347 3,135,334 3,521,763  
Options awarded (in shares) 81,492 67,155 185,007 345,945  
Options exercised (in shares)   (708,295) (576,518) (486,280)  
Options forfeited (in shares)   (22,559) (60,005) (97,443)  
Options expired (in shares)   (66,862) (62,471) (148,651)  
Number of options outstanding shares ending balance (in shares)   1,890,786 2,621,347 3,135,334  
Options shares vested (in shares)   601,367 825,682 805,781  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Exercise Price [Abstract]          
Options outstanding, weighted average exercise price, beginning balance (in dollars per share) $ 48.29 $ 47.01 $ 45.62 $ 44.58  
Options awarded, weighted average exercise price (in dollars per share) $ 55.74 $ 58.76 $ 55.94 $ 48.30  
Options exercised, weighted average exercise price (in dollars per share)   $ 45.32 $ 44.35 $ 39.29  
Options forfeited, weighted average exercise price (in dollars per share)   $ 50.36 $ 47.93 $ 46.89  
Options expired, weighted average exercise price (in dollars per share)   $ 45.97 $ 54.13 $ 51.35  
Options outstanding, weighted average exercise price, ending balance (in dollars per share)   $ 48.29 $ 47.01 $ 45.62  
Options vested, weighted average exercise price (in dollars per share)   $ 47.99 $ 46.72 $ 45.26  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Intrinsic Value [Abstract]          
Options outstanding, aggregate intrinsic value   11,748,000 20,769,000 24,405,000 10,359,000
Options vested, aggregate intrinsic value   3,890,000 6,779,000 6,556,000  
Options exercised, aggregate intrinsic value   8,300,000 5,500,000 6,100,000  
Weighted average assumptions used to determine fair value of stock options awarded [Abstract]          
Average risk-free interest rate (in hundredths)   0.93% [1] 1.87% [1] 2.36% [1]  
Dividend yield (in hundredths)   2.20% 1.80% 2.00%  
Volatility factors   28.00% 26.80% 26.10%  
Weighted average expected life   4 years 329 days 4 years 329 days 4 years 329 days  
Weighted average fair value (in dollars per share) $ 9.67 $ 11.48 $ 11.92 $ 10.17  
Share-based Compensation Costs, Including Costs That May Be Recognized As Future Expense [Abstract]          
Stock Option Expense   9,700,000 10,000,000 8,300,000  
Unrecognized compensation cost of unvested awards, for future periods   3,300,000      
Expected compensation cost as future expense for 2013   1,500,000      
Expected compensation cost as future expense for 2014   892,000      
Expected compensation cost as future expense for 2015   498,000      
Expected compensation cost as future expense for 2016   260,000      
Expected compensation cost as future expense for 2017   110,000      
Expected compensation cost as future expense thereafter   27,000      
Stock Options [Member] | Exercise Price 30.87 [Member]
         
Share-based Compensation Arragngement by Share-based Payment Award, Options, Outstanding, Number of Options [Abstract]          
Number of options outstanding shares ending balance (in shares)   426      
Options shares vested (in shares)   426      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Exercise Price [Abstract]          
Options outstanding, weighted average exercise price, ending balance (in dollars per share)   $ 30.87      
Options vested, weighted average exercise price (in dollars per share)   $ 30.87      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Intrinsic Value [Abstract]          
Weighted average remaining contractual life (in years)   0 years 4 days      
Weighted average remaining contractual life of options vested (in years)   0 years 4 days      
Stock Options [Member] | Exercise Price 37.74 [Member]
         
Share-based Compensation Arragngement by Share-based Payment Award, Options, Outstanding, Number of Options [Abstract]          
Number of options outstanding shares ending balance (in shares)   25,338      
Options shares vested (in shares)   25,338      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Exercise Price [Abstract]          
Options outstanding, weighted average exercise price, ending balance (in dollars per share)   $ 37.74      
Options vested, weighted average exercise price (in dollars per share)   $ 37.74      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Intrinsic Value [Abstract]          
Weighted average remaining contractual life (in years)   1 year 0 days      
Weighted average remaining contractual life of options vested (in years)   1 year 0 days      
Stock Options [Member] | Exercise Price 45.15 - 47.34 [Member]
         
Share-based Compensation Arragngement by Share-based Payment Award, Options, Outstanding, Number of Options [Abstract]          
Number of options outstanding shares ending balance (in shares)   77,569      
Options shares vested (in shares)   77,569      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Exercise Price [Abstract]          
Options outstanding, weighted average exercise price, ending balance (in dollars per share)   $ 47.32      
Options vested, weighted average exercise price (in dollars per share)   $ 47.32      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Intrinsic Value [Abstract]          
Weighted average remaining contractual life (in years)   1 year 15 days      
Weighted average remaining contractual life of options vested (in years)   1 year 15 days      
Stock Options [Member] | Exercise Price 47.05 [Member]
         
Share-based Compensation Arragngement by Share-based Payment Award, Options, Outstanding, Number of Options [Abstract]          
Number of options outstanding shares ending balance (in shares)   160,902      
Options shares vested (in shares)   90,785      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Exercise Price [Abstract]          
Options outstanding, weighted average exercise price, ending balance (in dollars per share)   $ 47.05      
Options vested, weighted average exercise price (in dollars per share)   $ 47.05      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Intrinsic Value [Abstract]          
Weighted average remaining contractual life (in years)   2 years 0 days      
Weighted average remaining contractual life of options vested (in years)   1 year 11 days      
Stock Options [Member] | Exercise Price 54.33 [Member]
         
Share-based Compensation Arragngement by Share-based Payment Award, Options, Outstanding, Number of Options [Abstract]          
Number of options outstanding shares ending balance (in shares)   297,887      
Options shares vested (in shares)   144,360      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Exercise Price [Abstract]          
Options outstanding, weighted average exercise price, ending balance (in dollars per share)   $ 54.33      
Options vested, weighted average exercise price (in dollars per share)   $ 54.33      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Intrinsic Value [Abstract]          
Weighted average remaining contractual life (in years)   2 years 183 days      
Weighted average remaining contractual life of options vested (in years)   1 year 15 days      
Stock Options [Member] | Exercise Price 48.46 [Member]
         
Share-based Compensation Arragngement by Share-based Payment Award, Options, Outstanding, Number of Options [Abstract]          
Number of options outstanding shares ending balance (in shares)   387,385      
Options shares vested (in shares)   133,184      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Exercise Price [Abstract]          
Options outstanding, weighted average exercise price, ending balance (in dollars per share)   $ 48.46      
Options vested, weighted average exercise price (in dollars per share)   $ 48.46      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Intrinsic Value [Abstract]          
Weighted average remaining contractual life (in years)   3 years 0 days      
Weighted average remaining contractual life of options vested (in years)   1 year 18 days      
Stock Options [Member] | Exercise Price 36.65 [Member]
         
Share-based Compensation Arragngement by Share-based Payment Award, Options, Outstanding, Number of Options [Abstract]          
Number of options outstanding shares ending balance (in shares)   371,373      
Options shares vested (in shares)   77,788      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Exercise Price [Abstract]          
Options outstanding, weighted average exercise price, ending balance (in dollars per share)   $ 36.65      
Options vested, weighted average exercise price (in dollars per share)   $ 36.65      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Intrinsic Value [Abstract]          
Weighted average remaining contractual life (in years)   3 years 183 days      
Weighted average remaining contractual life of options vested (in years)   1 year 15 days      
Stock Options [Member] | Exercise Price 48.30 [Member]
         
Share-based Compensation Arragngement by Share-based Payment Award, Options, Outstanding, Number of Options [Abstract]          
Number of options outstanding shares ending balance (in shares)   208,365      
Options shares vested (in shares)   13,468      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Exercise Price [Abstract]          
Options outstanding, weighted average exercise price, ending balance (in dollars per share)   $ 48.30      
Options vested, weighted average exercise price (in dollars per share)   $ 48.30      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Intrinsic Value [Abstract]          
Weighted average remaining contractual life (in years)   4 years 0 days      
Weighted average remaining contractual life of options vested (in years)   1 year 208 days      
Stock Options [Member] | Exercise Price 55.94 [Member]
         
Share-based Compensation Arragngement by Share-based Payment Award, Options, Outstanding, Number of Options [Abstract]          
Number of options outstanding shares ending balance (in shares)   273,792      
Options shares vested (in shares)   38,449      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Exercise Price [Abstract]          
Options outstanding, weighted average exercise price, ending balance (in dollars per share)   $ 55.94      
Options vested, weighted average exercise price (in dollars per share)   $ 55.94      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Intrinsic Value [Abstract]          
Weighted average remaining contractual life (in years)   5 years 0 days      
Weighted average remaining contractual life of options vested (in years)   2 years 26 days      
Stock Options [Member] | Exercise Price 58.76 [Member]
         
Share-based Compensation Arragngement by Share-based Payment Award, Options, Outstanding, Number of Options [Abstract]          
Number of options outstanding shares ending balance (in shares)   87,749      
Options shares vested (in shares)   0      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Exercise Price [Abstract]          
Options outstanding, weighted average exercise price, ending balance (in dollars per share)   $ 58.76      
Options vested, weighted average exercise price (in dollars per share)   $ 0.00      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Intrinsic Value [Abstract]          
Weighted average remaining contractual life (in years)   6 years 0 days      
Weighted average remaining contractual life of options vested (in years)   0 years 1 day      
Non-vested Common Stock [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period (in years) 3 years 5 years      
Required retention period after vesting (in years) 2 years 3 years      
Share-based Compensation Costs, Including Costs That May Be Recognized As Future Expense [Abstract]          
Unrecognized compensation cost of unvested awards, for future periods   14,000,000      
Expected compensation cost as future expense for 2013   4,900,000      
Expected compensation cost as future expense for 2014   4,200,000      
Expected compensation cost as future expense for 2015   3,000,000      
Expected compensation cost as future expense for 2016   1,700,000      
Expected compensation cost as future expense for 2017   $ 158,000      
Share-based Compensation Arrangement by Share-based Payment Award, Restricted Stock, Nonvested, Number of Shares [Roll Forward]          
Non-vested common shares awarded, beginning of period (in shares) 592,831 503,738      
Non-vested common shares awarded during period (in shares) 208,770 197,058      
Non-vested shares that vested during period (in shares)   (76,192)      
Non-vested shares that forfeited during period (in shares)   (31,773)      
Non-vested common shares awarded, end of period (in shares)   592,831      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]          
Weighted average grant date fair value of non-vested shares awarded (in dollars per share) $ 55.74 $ 55.63      
Weighted average grant date fair value non-vested stock awards vested (in dollars per share) $ 0.00 $ 47.32      
Weighted average grant date fair value non-vested stock awards forfeited (in dollars per share)   $ 50.45      
[1] 1 Average risk-free interest rate represents U.S. Treasury rates matched to the expected life of the options.