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Share-Based Compensation And Capital Stock Summary of Change in Stock-Based Award Activity (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Stock Options
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options, Exercisable, Number 953,159 792,499 576,577
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding Beginning - Shares 1,732,674 1,658,844 1,950,783
Granted - Shares 166,306 261,137 537,006
Exercised/Vested - Shares (175,386) (123,109) (764,612)
Forfeited/Expired - Shares (149,868) (64,198) (64,333)
Outstanding Ending - Shares 1,573,726 1,732,674 1,658,844
Outstanding Beginning - Weighted average exercise price $ 31.43 $ 30.05 $ 24.03
Granted - Weighted average exercise price $ 41.25 $ 32.84 $ 27.02
Exercised/Vested - Weighted average exercise price $ 21.92 $ 19.96 $ 11.98
Forfeited/Expired - Weighted average exercise price $ 33.76 $ 23.53 $ 37.13
Outstanding Ending - Weighted average exercise price $ 33.30 $ 31.43 $ 30.05
Share Based Compensation Arrangement By Share Based Payment Award Performance Based Leverage     0
Share Based Compensation Arrangement By Share Based Payment Award Options Performance Based Leverage Weighted Average Grant Date Fair Value     $ 0.00
Weighted Average Remaining Contractual Term Outstanding 4.2 4.4 5.4
Weighted Average Remaining Contractual Term Exercisable 3.8 3.5 4.4
Options, Exercisable, Weighted Average Exercise Price $ 33.36 $ 31.73 $ 27.67
Restricted Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding Beginning - Shares 592,131 539,341 482,236
Restricted share grants 247,298 279,157 262,128
Exercised/Vested - Shares (205,222) (184,571) (161,615)
Performance Based Leverage - shares     0
Forfeited/Expired - Shares (68,580) (41,796) (43,408)
Outstanding Ending - Shares 565,627 592,131 539,341
Outstanding Beginning - Weighted average grant date fair value $ 31.81 $ 31.68 $ 34.93
Weighted average grant date fair value per share $ 38.84 $ 33.07 $ 27.28
Exercised/Vested - Weighted average grant date fair value $ 32.46 $ 33.71 $ 34.48
Performance Based Leverage Weighted Average Grant Date Fair Value     $ 0.00
Forfeited/Expired - Weighted average grant date fair value $ 33.55 $ 30.31 $ 30.79
Outstanding Ending - Weighted average grant date fair value $ 34.43 $ 31.81 $ 31.68
Performance Vested Restricted Stock Units
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding Beginning - Shares 127,912 118,385 129,481
Restricted share grants 25,036 33,517 9,588
Exercised/Vested - Shares 0 (10,880) (19,761)
Performance Based Leverage - shares     5,123
Forfeited/Expired - Shares (43,179) (13,110) (6,046)
Outstanding Ending - Shares 109,769 127,912 118,385
Outstanding Beginning - Weighted average grant date fair value $ 33.43 $ 34.58 $ 37.00
Weighted average grant date fair value per share $ 41.25 $ 32.60 $ 26.88
Exercised/Vested - Weighted average grant date fair value $ 0.00 $ 40.65 $ 48.72
Performance Based Leverage Weighted Average Grant Date Fair Value     $ 48.72
Forfeited/Expired - Weighted average grant date fair value $ 32.53 $ 35.70 $ 39.95
Outstanding Ending - Weighted average grant date fair value $ 35.57 $ 33.43 $ 34.58