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Stock-Based Compensation (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
year
Dec. 31, 2010
Stock options
year
Dec. 31, 2009
Stock options
year
Dec. 31, 2011
Restricted stock awards
year
Dec. 31, 2010
Restricted stock awards
Dec. 31, 2009
Restricted stock awards
Feb. 29, 2008
Restricted stock awards
Executive Management
Dec. 31, 2011
Performance share awards
Dec. 31, 2010
Performance share awards
Number of Shares                        
Outstanding at the beginning of the period (in shares)       4,235,403 4,155,570 2,814,003            
Options granted (in shares)       637,255 610,020 1,602,895            
Options exercised (in shares)       (552,639) (325,883) (75,718)            
Options expired (in shares)           (20,000)            
Options forfeited (in shares)       (227,404) (204,304) (165,610)            
Outstanding at the end of the period (in shares)       4,092,615 4,235,403 4,155,570            
Weighted Average Exercise Price                        
Outstanding at the beginning of the period (in dollars per share)       $ 30.38 $ 29.09 $ 33.91            
Options granted (in dollars per share)       $ 38.23 $ 34.05 $ 19.60            
Options exercised (in dollars per share)       $ 27.61 $ 24.68 $ 18.42            
Options expired (in dollars per share)           $ 22.78            
Options forfeited (in dollars per share)       $ 29.13 $ 24.32 $ 24.78            
Outstanding at the end of the period (in dollars per share)       $ 32.05 $ 30.38 $ 29.09            
Weighted-average grant-date fair value       $ 6.7 $ 5.7 $ 7.3            
Total intrinsic value of options exercised       11.0 4.4 1.1            
Weighted average contractual term (in years)       6.56 6.89 7.42            
Number of options exercisable (in shares)       2,642,842 2,480,302 2,182,137            
Weighted average exercise price of exercisable options (in dollars per share)       $ 32.95 $ 33.24 $ 34.70            
The weighted average contractual term of options exercisable (in years)       5.53 5.84              
Aggregate intrinsic value of options outstanding       44.6 17.7              
Aggregate intrinsic value of options exercisable       44.6 17.7              
Total fair value of options vested       6.0 3.0 5.2            
Vesting period (in years) of shares awarded in 2008             3 years     5 years 3 years  
Stock-based compensation expense                        
Compensation expense recognized 15.7 13.3 13.9       5.2 5.6 6.0   3.8 1.6
Unrecognized compensation cost             $ 4.2       $ 5.6 $ 3.5
Weighted average period of recognition of unrecognized compensation cost related to restricted stock awards (in years)             1.7          
Award Activity                        
Outstanding balance at the beginning of the period (in shares)             624,640 625,570 473,950   98,835  
Shares granted             111,685 101,785 275,005 56,700 109,075 101,785
Shares vested             (188,195) (94,790) (95,410)      
Shares forfeited             (19,555) (7,925) (27,975)   (10,255) (2,950)
Outstanding balance at the end of the period (in shares)             528,575 624,640 625,570   197,655 98,835
Restricted Stock Awards                        
Outstanding balance at the beginning of the period (in dollars per share)             $ 28.10 $ 29.07 $ 37.06      
Shares granted (in dollars per share)             $ 38.31 $ 34.21 $ 18.57   $ 53.95 $ 50.36
Shares vested (in dollars per share)             $ 34.80 $ 40.87 $ 36.92      
Shares forfeited (in dollars per share)             $ 20.33 $ 30.59 $ 34.50      
Outstanding balance at the end of the period (in dollars per share)             $ 27.83 $ 28.10 $ 29.07