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Share-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]     
Share-based compensation$ 6.1$ 6.4$ 22.5$ 22.4 
Compensation expense recognized  22.522.4 
Stock options granted  200,000540,000 
Grant date fair value of options  $ 4.39$ 4.81 
Intrinsic value of options exercised 0 2.1 
Weighted-average grant date fair value$ 13.95 $ 13.95 $ 12.96
Restricted stock units expected to vest5,011,000 5,011,000 5,430,000
Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]     
Intrinsic value of options exercised0.1 1.0  
Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]     
Granted performance share unit awards, amount payable  235,000  
Performance Share Unit Awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]     
Compensation expense related to award performance0.3 0.9  
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized2.7 2.7  
Unrecognized compensation expense, weighted-average period of recognition, in years  2.3  
Granted performance share unit awards, amount payable per employee  235,000  
Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]     
Granted performance share unit awards, amount payable  117,500  
Stock Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]     
Compensation expense recognized0.60.82.02.3 
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized3.6 3.6  
Unrecognized compensation expense, weighted-average period of recognition, in years  2.2  
Restricted Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]     
Compensation expense recognized5.25.619.620.1 
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized$ 31.8 $ 31.8  
Weighted-average grant date fair value$ 13.85 $ 13.85  
Restricted stock units expected to vest4,700,000 4,700,000  
Expected weighted-average vesting period for restricted stock, in years  2.0