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Share-Based Compensation Plans (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Stock options
Y
Dec. 31, 2010
Stock options
Y
Dec. 31, 2009
Stock options
Y
Dec. 31, 2011
Stock options
Non-employee director
Aug. 31, 2011
Restricted stock, 2011 grant
Aug. 08, 2011
Restricted stock, 2011 grant
Jul. 31, 2010
Restricted stock, 2010 grant
Dec. 31, 2011
Restricted stock, 2010 grant
Aug. 02, 2011
Restricted stock, 2010 grant
Dec. 31, 2011
Options with ten-year term
May 31, 2011
Directors Equity Plan
Restricted stock
Y
Share-Based Compensation Plans                            
Shares authorized for future grant 3,527,077                          
Number of shares                            
Outstanding at the beginning of the period (in shares)       3,880,052 3,809,229 3,418,772                
Granted (in shares)       1,037,250 1,039,400 977,300                
Exercised (in shares)       (266,392) (827,452) (427,697)                
Expired or forfeited (in shares)       (135,350) (141,125) (159,146)                
Outstanding at the end of the period (in shares)       4,515,560 3,880,052 3,809,229 192,000           242,925  
Exercisable at the end of the period (in shares)       2,146,035                    
Weighted Average Exercise Price                            
Outstanding at the beginning of the period, Weighted Average Exercise Price (in dollars per share)       $ 44.76 $ 41.22 $ 41.57                
Granted, Weighted Average Exercise Price (in dollars per share)       $ 55.73 $ 42.89 $ 33.86                
Exercised, Weighted Average Exercise Price (in dollars per share)       $ 41.60 $ 25.68 $ 24.53                
Expired or forfeited, Weighted Average Exercise Price (in dollars per share)       $ 47.57 $ 47.10 $ 48.35                
Outstanding at the end of the period, Weighted Average Exercise Price (in dollars per share)       $ 47.39 $ 44.76 $ 41.22                
Exercisable at the end of the period, Weighted Average Exercise Price (in dollars per share)       $ 46.59                    
Weighted Average Remaining Contractual Term (In years)                            
Weighted Average Remaining Contractual Term, stock options outstanding (in years)       4.4                    
Weighted Average Remaining Contractual Term, stock options exercisable (in years)       3.5                    
Aggregate Intrinsic Value (In millions)                            
Aggregate Intrinsic Value, options outstanding       $ 21.2                    
Aggregate Intrinsic Value, options exercisable       11.1                    
Vesting period (in years)       4 years     1 year              
Award expiration (in years)       P7Y                 P10Y  
Weighted average assumptions:                            
Exercise price (in dollars per share)       $ 55.73 $ 42.89 $ 33.86                
Risk free interest rate (as a percent)       2.20% 2.35% 1.87%                
Expected life in years       4.8 4.8 4.8                
Expected volatility (as a percent)       60.00% 60.00% 59.00%                
Expected dividend yield (as a percent)       0.86% 0.93% 1.18%                
Grant date fair value (in dollars per share)       $ 26.98 $ 20.62 $ 15.58                
Changes in non-vested stock options                            
Non-vested at the beginning of the period (in shares)       2,405,950                    
Granted (in shares)       1,037,250 1,039,400 977,300                
Forfeited (in shares)       (103,600)                    
Vested (in shares)       (970,075)                    
Non-vested at the end of the period (in shares)       2,369,525 2,405,950                  
Weighted Average Grant Date Fair Value                            
Non-vested options at the beginning of the period (in dollars per share)       $ 18.66                    
Granted (in dollars per shares)       $ 26.98 $ 20.62 $ 15.58                
Forfeited (in dollars per shares)       $ 21.25                    
Vested (in dollars per shares)       $ 18.43                    
Non-vested options at the end of the period (in dollars per shares)       $ 22.28 $ 18.66                  
Restricted stock                            
Restricted stock granted (in shares)               86,000   61,000       16,079
Annual vesting percentage                 20.00%     20.00%    
Fair value of restricted stock granted (in dollars per share)               $ 37.29   $ 41.24       $ 52.24
Number of shares unvested and outstanding at period end                     48,800      
Period of restriction for trading of shares automatically granted to directors (in years)                           1
Additional share-based compensation disclosures                            
Total unrecognized compensation cost       39.9                    
Weighted average recognition period for unrecognized compensation cost (in years)       2.7                    
Proceed from option exercises 11.1 21.2 10.5 11.1 21.2 10.5                
Tax benefit realized from option exercises       1.3 6.3 2.7                
Total intrinsic value of all options exercised       $ 3.4 $ 16.6 $ 6.9