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Stock-based Compensation Plans (Narrative) (Details)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Feb. 24, 2020
$ / shares
shares
Jan. 28, 2020
$ / shares
shares
Dec. 03, 2019
$ / shares
shares
Mar. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
$ / shares
shares
Mar. 31, 2019
USD ($)
shares
Mar. 31, 2020
USD ($)
$ / shares
shares
Mar. 31, 2019
USD ($)
shares
Share-based Payment Arrangement, Expense | $       $ 1.3   $ 1.0 $ 3.2 $ 2.7
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $       $ 10.4     $ 10.4  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount       267,697   202,245 184,296 1,077,983
Phantom Share Units (PSUs) [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instrument Other than Option, Nonvested, Intrinsic Value | $ / shares       $ 8.01     $ 8.01  
Share-based compensation liability | $       $ 1.0     $ 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             209,966  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         3 years      
Share-based compensation, units awarded but not yet granted       232,262     232,262  
Restricted Stock Units (RSUs) [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period       114,691     246,994  
Granted, shares       118,684 162,433      
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       $ 12.14 $ 11.26      
Granted, shares       118,684 162,433      
Market Based Performance Shares                
Granted, shares 7,498 2,763 147,213 10,261 147,213   157,474  
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 1730000.00% 1760000.00% 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 $ 18.17 $ 16.76 $ 14.94 $ 17.79 $ 14.94      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 1230000.00% 1440000.00% 1530000.00%          
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 2 years 7 months 6 days 2 years 8 months 1 day 2 years 9 months 29 days          
Granted, shares 7,498 2,763 147,213 10,261 147,213   157,474  
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       13,682 65,428      
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       $ 12.09 $ 11.26      
Granted, shares       13,682 65,428      
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