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Stock-based Compensation Plans (Narrative) (Details)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
shares
Sep. 30, 2019
Share-based Payment Arrangement, Expense | $ $ 1.9 $ 1.7  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ $ 11.8    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 108,976 165,467  
Phantom Share Units (PSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instrument Other than Option, Nonvested, Intrinsic Value | $ / shares $ 11.98    
Share-based compensation liability | $ $ 1.0    
Granted, shares 188,973    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares $ 11.26    
Granted, shares 188,973    
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 93,647 181,065  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 196,284    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years
Share-based compensation, units awarded but not yet granted 218,292    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 132,303    
Granted, shares 162,433    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares $ 11.26    
Granted, shares 162,433    
Market Based Performance Shares      
Granted, shares 147,213    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate 1870000.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares $ 14.94    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 1530000.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 2 years 9 months 29 days    
Granted, shares 147,213    
Minimum [Member] | Performance Shares [Member]      
Performance Factors 0    
Minimum [Member] | Market Based Performance Shares      
Performance Factors 0    
Maximum [Member] | Performance Shares [Member]      
Performance Factors 2    
Maximum [Member] | Market Based Performance Shares      
Performance Factors 2    
Share-based Payment Arrangement, Tranche One [Member] | Performance Shares [Member]      
Granted, shares 58,040    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares $ 11.26    
Granted, shares 58,040    
Share-based Payment Arrangement, Tranche Two [Member] | Performance Shares [Member]      
Granted, shares 102,203    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares $ 11.26    
Granted, shares 102,203    
Share-based Payment Arrangement, Tranche Three [Member] | Performance Shares [Member]      
Granted, shares 44,451    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares $ 11.26    
Granted, shares 44,451