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Share-Based Compensation (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Equity stock-based compensation    
Total share-based compensation expense included in net income $ 4,600,000 $ 4,300,000
Income tax benefit related to share-based compensation expense included in net income 1,400,000 1,400,000
Stock Option Awards
   
Equity stock-based compensation    
Term of options 10 years  
Period of vesting 3 years  
Assumptions used to measure the fair value of awards    
Expected life 5 years 9 months 18 days 5 years 9 months 18 days
Risk-free interest rate (as a percent) 1.11% 1.07%
Expected volatility (as a percent) 32.64% 33.33%
Expected dividend yield (as a percent) 1.57% 1.18%
Stock option activity    
Outstanding at the beginning of the period (in shares) 3,032  
Granted (in shares) 415 457
Exercised (in shares) (287)  
Cancelled (in shares) (19)  
Outstanding at the end of the period (in shares) 3,141  
Exercisable at the end of the period (in shares) 2,304  
Share options, weighted average exercise price    
Outstanding at the beginning of the period (in dollars per share) $ 35.66  
Granted (in dollars per share) $ 66.07  
Exercised (in dollars per share) $ 29.64  
Cancelled (in dollars per share) $ 56.44  
Outstanding at the end of the period (in dollars per share) $ 40.13  
Exercisable at the end of the period (in dollars per share) $ 33.05  
Share options, aggregate intrinsic value    
Options outstanding average remaining contractual life 6 years 4 months 20 days  
Options outstanding aggregate intrinsic value 101,148,000  
Stock options exercisable average remaining contractual life 5 years 4 months 13 days  
Stock options exercisable aggregate intrinsic value 90,468,000  
Additional information pertaining to stock options    
Cash received from exercise of stock options 8,000,000  
Unrecognized compensation cost 12,000,000  
Weighted-average period for amortization of unrecognized compensation cost 1 year 10 months 24 days  
Weighted-average grant date fair value of stock options granted (in dollars per share) $ 17.87 $ 16.16
Total intrinsic value of stock options exercised $ 11,185,000 $ 10,997,000