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Stock-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2012
Restricted Shares [Member]
Mar. 31, 2012
Stock Options [Member]
Mar. 31, 2012
Restricted Stock Units And Phantom Stock Awards [Member]
Mar. 31, 2012
Performance Based Restricted Stock Units [Member]
Mar. 31, 2012
Employee Awards [Member]
Stock Options [Member]
Mar. 31, 2012
Employee Awards [Member]
Restricted Stock Units And Phantom Stock Awards [Member]
Dec. 31, 2011
Non-Employee Awards [Member]
Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vesting period, years             four four one
Contractual life of options, in years       10          
Additional shares available for issuance 3.5                
Compensation cost $ 1.3 $ 1.1              
Income tax benefit recognized in the income statement for stock-based awards 0.2 0.3              
Unrecognized compensation cost     6.3 6.1 1.8 2.6      
Expected recognized weighted-average period of cost, in years     3.2 2.0 2.9 3.5      
Stock options issued 0.4 0.4              
Weighted-average fair value per option granted $ 6.85 $ 8.15              
Total cash received as a result of stock option exercises 1.4 0.8              
Tax benefit realized as a result of stock option exercises and the vesting of other share-based awards 0.5 0.2              
Total intrinsic value of stock options exercised $ 0.6 $ 0.4