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Share-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 7.4 $ 6.5
Stock options granted 1,221,000 200,000
Weighted average fair market value of options granted $ 2.96 $ 4.39
Intrinsic value of options exercised 1.2 1.0
Restricted Stock [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense 5.8 5.4
Unrecognized share-based compensation cost 28.6  
Unrecognized compensation expense, weighted-average period of recognition 2 years 4 months 24 days  
Granted, shares 817,000  
Grant date fair market value of the awards granted $ 10.65  
Equity instruments other than options expected to vest, shares 3,100,000  
Equity instruments other than options expected to vest, weighted-average grant date fair value $ 11.79  
Stock Options [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense 1.1 0.8
Unrecognized share-based compensation cost 5.1  
Unrecognized compensation expense, weighted-average period of recognition 3 years  
Performance Share Unit Awards [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense 0.5 0.3
Unrecognized share-based compensation cost $ 4.3  
Unrecognized compensation expense, weighted-average period of recognition 2 years 3 months 18 days  
Granted, shares 233,000 235,000
Grant date fair market value of the awards granted $ 10.12 $ 15.54
Equity instruments other than options, minimum expected grants in period   117,500
Equity instruments other than options, maximum expected grants in period 235,000 235,000
Minimum [Member] | Performance Share Unit Awards [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Equity instruments other than options, minimum expected grants in period 116,500  
Equity instruments other than options, maximum expected grants in period 233,000  
Maximum [Member] | Performance Share Unit Awards [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Equity instruments other than options, minimum expected grants in period 117,500  
Equity instruments other than options, maximum expected grants in period 235,000