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Stock-based Compensation Plans (Narrative) (Details)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
shares
Mar. 31, 2016
USD ($)
shares
Mar. 31, 2017
USD ($)
$ / shares
shares
Mar. 31, 2016
USD ($)
shares
Allocated Share-based Compensation Expense | $ $ 2.0   $ 1.8 $ 4.7 $ 3.6
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ $ 13.6     $ 13.6  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 367,841   1,038,029 350,286 1,016,155
Phantom Share Units (PSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 12,145 187,115      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Intrinsic Value, Amount Per Share | $ / shares $ 11.82     $ 11.82  
Share-based compensation liability | $ $ 1.9     $ 1.9  
Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period       263,410  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       234,895  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       3 years  
Share-based compensation, units awarded but not yet granted 219,866     219,866  
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 165,999 177,861      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 91,547     346,961  
Minimum [Member] | Performance Shares [Member]          
Performance Factor       0  
Maximum [Member] | Performance Shares [Member]          
Performance Factor       2  
Share-based Compensation Award, Tranche One [Member] | Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 19,012 59,285      
Performance Factor       1.021  
Share-based Compensation Award, Tranche Two [Member] | Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   73,826      
Performance Factor       2  
Share-based Compensation Award, Tranche Three [Member] | Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   68,556      
Performance Factor       0