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Stock-based Compensation Plans (Narrative) (Details)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2018
USD ($)
$ / shares
shares
Mar. 31, 2017
USD ($)
shares
Mar. 31, 2018
USD ($)
$ / shares
shares
Mar. 31, 2017
USD ($)
shares
Allocated Share-based Compensation Expense | $ $ 1.6 $ 2.0 $ 4.0 $ 4.7
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ $ 8.2   $ 8.2  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 289,860 367,841 278,697 350,286
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 $ 10.87   $ 10.87  
Share-based compensation liability | $ $ 1.3   $ 1.3  
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period     146,061 263,410
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     171,288  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years  
Share-based compensation, units awarded but not yet granted 178,105   178,105  
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 125,173   338,705  
Minimum [Member] | Performance Shares [Member]        
Performance Factor     0  
Maximum [Member] | Performance Shares [Member]        
Performance Factor     2