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Compensation Plans (Details 2) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Stock Options
D
Y
Dec. 31, 2010
Stock Options
Y
Dec. 31, 2009
Stock Options
Y
Dec. 31, 2011
Restricted Stock and Performance Restricted Stock Units
Y
Dec. 31, 2010
Restricted Stock and Performance Restricted Stock Units
Dec. 31, 2009
Restricted Stock and Performance Restricted Stock Units
Dec. 31, 2011
Restricted stock
Dec. 31, 2011
Restricted Stock Units
Aug. 31, 2006
Restricted Stock Units
Chairman and Chief Executive Officer
Dec. 31, 2011
Restricted Stock Units
Chairman and Chief Executive Officer
Dec. 31, 2011
23.34 - 25.52
Stock Options
Y
Dec. 31, 2011
27.11 - 28.35
Stock Options
Y
Dec. 31, 2011
31.95 - 39.72
Stock Options
Y
Shares Authorized under Stock Option Plan Exercise Price Range                                
Exercise Price Range, Lower Range Limit (in dollars per share)                           $ 23.34 $ 27.11 $ 31.95
Exercise Price Range, Upper Range Limit (in dollars per share)                           $ 25.52 $ 28.35 $ 39.72
Shares under Options (in shares)       6,524,000                   2,327,000 1,960,000 2,237,000
Weighted Average Exercise Price (in dollars per share)       $ 28.76                   $ 23.81 $ 27.74 $ 34.80
Weighted Average Remaining Contractual Term (in years)       6.1                   6.1 5.3 6.7
Currently Exercisable - Shares Under Options (in shares)       3,239,000                   1,032,000 1,245,000 962,000
Currently Exercisable - Weighted Average Exercise Price (in dollars per share)       $ 28.60                   $ 24.41 $ 27.39 $ 34.66
Share-based Compensation Arrangement by Share-based Payment Award, Options Unvested                                
Unvested at the beginning of the period (in shares)       3,889,000                        
Granted (in shares)       710,000                        
Vested (in shares)       (1,159,000)                        
Forfeited (in shares)       (155,000)                        
Unvested at the end of the period (in shares)       3,285,000 3,889,000                      
Unvested at the beginning of the period, weighted average grant date fair value (in dollars per share)       $ 3.24                        
Granted, weighted average grant date fair value (in dollars per share)       $ 5.97 $ 5.17 $ 2.23                    
Vested, weighted average grant date fair value (in dollars per share)       $ 3.10                        
Forfeited, weighted average grant date fair value (in dollars per share)       $ 5.54                        
Unvested at the end of the period, weighted average grant date fair value (in dollars per share)       $ 3.77 $ 3.24                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Other Information                                
Total vesting date intrinsic values of shares under options vested       $ 15.8 $ 10.7 $ 1.8                    
Total intrinsic value of vested shares under options at the end of the period       42.3                        
Proceeds received from options exercised       30.8 6.3 7.4                    
Total intrinsic value of options exercised       13.4 2.3 4.9                    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology                                
Implied volatility traded option on common stock period (in days)       30                        
Risk-free rate (as a percent)       2.58% 2.77% 2.27%                    
Expected life (in years)       6.5 6.3 6.5                    
Expected volatility (as a percent)       31.80% 35.00% 26.00%                    
Expected dividend yield (as a percent)       6.10% 6.20% 7.30%                    
Restricted Stock and Performance Restricted Stock Units                                
Share-based compensation award vesting period, low end of the range (in years)             P3Y                  
Share-based compensation award vesting period, high end of the range (in years)             P5Y                  
Performance restricted stock unit is convertible into common stock (in shares)             1.00                  
Shares withheld to offset tax withholding obligations (in shares)             136,000 154,000 110,000              
Weighted-average remaining vesting period of restricted stock and restricted stock units (in years)             3                  
Total fair values of restricted stock and restricted stock units vested             14.4 12.5 7.6              
Stock-based awards, vesting period (in years)                         10 years      
Unvested restricted stock and performance restricted stock units activity                                
Unvested at the beginning of the period (in shares)                   536,000 1,026,000          
Granted (in shares)                     764,000 219,000        
Vested (in shares)                   (162,000) (228,000)          
Forfeited (in shares)                   (35,000) (84,000)          
Unvested at the end of the period (in shares)                   339,000 1,478,000   303,000      
Unvested at the beginning of the period, Weighted Average Grant Date Fair Value (in dollars per share)                   $ 28.08 $ 29.71          
Granted, Weighted Average Grant Date Fair Value (in dollars per share)                     $ 37.22          
Vested, Weighted Average Grant Date Fair Value (in dollars per share)                   $ 28.91 $ 29.46          
Forfeited, Weighted Average Grant Date Fair Value (in dollars per share)                   $ 27.61 $ 34.51          
Unvested at the end of the period, Weighted Average Grant Date Fair Value (in dollars per share)                   $ 27.75 $ 32.59          
Employee Benefit Plan                                
Matching contribution by Company, maximum percentage of participant's eligible compensation (as a percent) 4.00%                              
Matching contributions to Employee Benefit Plan $ 0.8 $ 0.9 $ 0.7