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Stock-Based Compensation Narrative (Details) (USD $)
In Millions, except 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]      
Number of shares available for grant 3,765,911    
Total annual compensation cost recognized $ 3.4 $ 4.7 $ 30.1
Stock option total annual compensation costs not yet recognized 0.4    
PBRSUs | Minimum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of units vesting 0.00%    
PBRSUs | Maximum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of units vesting 150.00%    
RSUs
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years) 3 years    
Matching contribution by entity (as a percent) 25.00%    
Increase in APIC due to conversion of the 2011 annual bonuses into RSUs 0.6    
Stock Options
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years) 3 years    
Weighted-average period for unrecognized compensation costs 1 year 0 months 14 days    
Option contractual term 10 years    
Incentive Shares
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total annual compensation cost recognized   2.6 28.7
RSAs, RSUs and PBRSUs
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost not yet recognized $ 5.0    
Weighted-average period for unrecognized compensation costs 1 year 9 months 10 days