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Share-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Share-based compensation $ 9.9 $ 7.8 $ 16.4 $ 16.0  
Granted, shares     1,524,000    
Compensation expense recognized     16.4 16.0  
Stock options granted     200,000 540,000  
Grant date fair value of options     $ 4.39 $ 4.81  
Intrinsic value of options exercised   0.1   2.1  
Weighted-average grant date fair value $ 13.97   $ 13.97   $ 12.96
Restricted stock units expected to vest 5,047,000   5,047,000   5,430,000
Maximum [Member]
         
Intrinsic value of options exercised 0.1   1.0    
Maximum [Member]
         
Granted performance share unit awards, amount payable     235,000    
Performance Share Unit Awards [Member]
         
Compensation expense related to award performance 0.3   0.6    
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized 3.0   3.0    
Unrecognized compensation expense, weighted-average period of recognition, in years     2.5    
Granted performance share unit awards, amount payable per employee     235,000    
Minimum [Member]
         
Granted performance share unit awards, amount payable     117,500    
Stock Options [Member]
         
Compensation expense recognized 0.6 0.8 1.4 1.5  
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized 4.2   4.2    
Unrecognized compensation expense, weighted-average period of recognition, in years     2.3    
Restricted Stock [Member]
         
Compensation expense recognized 9.0 7.0 14.4 14.5  
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized $ 37.6   $ 37.6    
Weighted-average grant date fair value $ 13.87   $ 13.87    
Restricted stock units expected to vest 4,800,000   4,800,000    
Expected weighted-average vesting period for restricted stock, in years     2.3