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Stock-Based and Other Compensation Plans (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense $ 0.1 $ 0.3 $ 3.4 $ 2.9
Stock-Based Compensation Mark-to-Market (1.1) $ (0.7) (0.2) (0.5)
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 12.8   $ 12.8  
Stock Options, SARs, and Restricted Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition     2 years  
Performance-Based Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition     2 years  
Deferred Compensation, Share-based Payments [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common shares deferred under deferred compensation plans 0.3 0.5    
Deferred Compensation, Compensation Expense $ (0.2) $ (0.6)   $ (0.2)