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Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense related to all stock-based compensation plans $ 8.8 $ 8.4 $ 7.8  
Phantom Stock [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 75,816      
Allocated Share-based Compensation Expense 0.3      
Restricted Stock [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 512,085 625,049 836,877 867,413
Allocated Share-based Compensation Expense 2.1 1.8 1.5  
Chief Executive Officer [Member] | Restricted Stock [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation costs 0.8      
Weighted-average period of years costs are expected to be recognied over 2 years 3 months 18 days      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 300,000      
Allocated Share-based Compensation Expense $ 0.3