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Stock-based Compensation Plans (Narrative) (Details)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jan. 27, 2021
Dec. 02, 2020
Mar. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
$ / shares
shares
Mar. 31, 2020
USD ($)
shares
Mar. 31, 2021
USD ($)
$ / shares
shares
Mar. 31, 2020
USD ($)
shares
Share-based Payment Arrangement, Expense | $     $ 2.5   $ 1.3 $ 5.0 $ 3.2
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $     $ 13.2     $ 13.2  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount     664,082   267,697 447,086 184,296
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares     45,517     108,950  
Phantom Share Units (PSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instrument Other than Option, Nonvested, Intrinsic Value | $ / shares     $ 13.89     $ 13.89  
Share-based compensation liability | $     $ 2.0     $ 2.0  
Granted, shares     1,254 180,987      
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     $ 11.94 $ 11.86      
Granted, shares     1,254 180,987      
Performance Shares [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period           103,058  
Share-based compensation, units awarded but not yet granted     199,994     199,994  
Restricted Stock Units (RSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period     93,973     219,549  
Granted, shares     82,565 129,081      
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     $ 12.81 $ 11.86      
Granted, shares     82,565 129,081      
Market Based Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate 1.84% 1.77%          
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 0.16% 0.21%          
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 2 years 8 months 1 day 2 years 9 months 29 days          
Granted, shares     4,187 234,199      
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 1.84% 1.77%          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares     $ 14.26 $ 15.39      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 0.16% 0.21%          
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 2 years 8 months 1 day 2 years 9 months 29 days          
Granted, shares     4,187 234,199      
Equity Option              
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate     2.01% 2.01%      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate     0.66% 0.66%      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term     6 years 6 years      
Granted, shares     8,115 423,405      
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     2.01% 2.01%      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares     $ 3.08 $ 3.05      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate     0.66% 0.66%      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term     6 years 6 years      
Granted, shares     8,115 423,405      
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 Two [Member] | Performance Shares [Member]              
Granted, shares       60,019      
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       $ 11.86      
Granted, shares       60,019      
Share-based Payment Arrangement, Tranche Three [Member] | Performance Shares [Member]              
Granted, shares       84,483      
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       $ 11.86      
Granted, shares       84,483