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Stock-Based and Other Compensation Plans (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense $ 3.5 $ 1.3 $ 5.4 $ 3.3
Stock-Based Compensation Mark-to-Market 1.1 $ 0.5 1.4 0.9
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 12.3   $ 12.3  
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     1 year  
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 0.3    
Deferred Compensation, Compensation Expense $ 0.2 $ 0.1 $ 0.3 $ 0.2