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Stock-based Compensation Plans (Narrative) (Details)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Nov. 28, 2023
Jun. 30, 2024
USD ($)
$ / shares
shares
Mar. 31, 2024
$ / shares
shares
Dec. 31, 2023
$ / shares
shares
Jun. 30, 2023
USD ($)
shares
Jun. 30, 2024
USD ($)
$ / shares
shares
Jun. 30, 2023
USD ($)
shares
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 2.00%            
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 4.50%            
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 2 years 10 months 2 days            
Share-based Payment Arrangement, Expense | $   $ 3.7     $ 2.7 $ 10.1 $ 8.8
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $   $ 12.3       $ 12.3  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount   24,636     249,933 520,420 1,156,428
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation   249       120,162  
Phantom Share Units (PSUs) [Member]              
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   $ 15.70 $ 15.71 $ 13.22      
Granted, shares   3,183 2,544 230,523      
Share-based compensation liability | $   $ 4.1       $ 4.1  
Share Based Compensation Arrangement By Share Based Payment Award, Fair Value | $ / shares   $ 17.92       $ 17.92  
Performance Shares [Member]              
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       $ 13.22      
Granted, shares       136,983      
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period           3 years  
Shares Issued, Shares, Share-Based Payment Arrangement, before Forfeiture   0       168,897  
Restricted Stock Units (RSUs) [Member]              
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   $ 18.44 $ 15.59 $ 13.27      
Granted, shares   55,572 81,136 161,943      
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period           3 years  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period   696       260,110  
Market Based Performance Shares              
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       $ 18.11      
Granted, shares       136,983      
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period           3 years  
Share-based Payment Arrangement, Option [Member]              
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 1.94%            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares       $ 3.96      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 4.33%            
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 6 years            
Granted, shares       457,356      
Shares Issued, Shares, Share-Based Payment Arrangement, before Forfeiture   51,708       122,258  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period           3 years  
Employee Stock [Member]              
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   $ 3.01 $ 2.62 $ 3.48      
Granted, shares   31,659 35,998 31,139      
Share-Based Compensation Arrangement by Share-Based Payment Award, Discount from Market Price, Offering Date   85.00%          
Minimum [Member] | Performance Shares [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Performance Factors           0  
Minimum [Member] | Market Based Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Performance Factors           0  
Maximum [Member] | Performance Shares [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Performance Factors           2  
Maximum [Member] | Market Based Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Performance Factors           2