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Stock-Based Compensation (Restricted Stock) (Details) (Restricted Stock [Member], USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total fair value of vested restricted stock awards $ 5.8 $ 5.5 $ 2.2
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Nonvested, Shares, beginning balance 0.4    
Nonvested, Weighted-Average Grant Date Fair Value, beginning balance $ 21.17    
Granted, Shares 0.2 [1]    
Granted, Weighted-Average Grant Date Fair Value $ 34.31 [1] $ 32.50 [1] $ 18.20 [1]
Vested, Shares (0.2)    
Vested, Weighted-Average Grant Date Fair Value $ 18.75    
Forfeited, Shares (0.1)    
Forfeited, Weighted-Average Grant Date Fair Value $ 29.47    
Nonvested, Shares, ending balance 0.3 0.4  
Nonvested, Weighted-Average Grant Date Fair Value, ending balance $ 27.81 $ 21.17  
Employee Awards Granted in Years Prior to and Including 2008 [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting increments (percentage) 25.00%    
Vesting period (in years) 4 years    
Years Subsequent to 2008 [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years) 4 years    
[1] The restricted stock awards granted during 2012 are primarily related to our employee annual restricted stock award grant in March 2012.