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Stock-based Compensation Plans (Narrative) (Details)
$ / shares in Units, $ in Millions
3 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
shares
Allocated Share-based Compensation Expense | $ $ 2.7 $ 1.9
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ $ 13.6  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 323,010 1,042,254
Phantom Share Units (PSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Intrinsic Value, Amount Per Share | $ / shares $ 13.31  
Share-based compensation liability | $ $ 1.5  
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 177,861  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years  
Share-based compensation, units awarded but not yet granted 192,402  
Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 255,414  
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]    
Performance Factor 1  
Share-based Compensation Award, Tranche Two [Member] | Performance Shares [Member]    
Performance Factor 2  
Share-based Compensation Award, Tranche Three [Member] | Performance Shares [Member]    
Performance Factor 0