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Stock-based Compensation Plans Grants Table - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock Granted, Value, Share-based Compensation, Gross       $ 9.1
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted, shares 32,935 93,849 233,471  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 10.92 $ 8.63 $ 9.38  
Stock Granted, Value, Share-based Compensation, Gross $ 0.4 $ 0.8 $ 2.2  
Employee Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted, shares 53,112 58,411 61,313  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 1.82 $ 1.67 $ 1.84  
Stock Granted, Value, Share-based Compensation, Gross $ 0.1 $ 0.1 $ 0.1  
Phantom Share Units (PSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted, shares 69,285 1,500 232,090  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 11.43 $ 8.11    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value     $ 9.38  
Stock Granted, Value, Share-based Compensation, Gross $ 0.8 $ 0.0 $ 2.2  
Share-based Compensation Award, Tranche One [Member] | Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted, shares     77,824  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value     $ 9.38  
Stock Granted, Value, Share-based Compensation, Gross     $ 0.7  
Share-based Compensation Award, Tranche Two [Member] | Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted, shares     80,229  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value     $ 9.38  
Stock Granted, Value, Share-based Compensation, Gross     $ 0.8  
Share-based Compensation Award, Tranche Three [Member] | Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted, shares     90,849  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value     $ 9.38  
Stock Granted, Value, Share-based Compensation, Gross     $ 0.9