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Stock-based Compensation Plans (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Dec. 14, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 578,005 267,298 106,896    
Weighted-average recognition period, Compensation expense related to stock awards not yet vested 1 year 4 months 24 days        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 8.6        
Number of shares authorized under a Plan         20,500,000
Shares available for future grants under a Plan 5,806,070        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years        
Share-based Compensation, Expected Forfeiture Rate 2.00%        
Phantom Share Units (PSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years        
Settlement of performance-based restricted stock units, net of shares withheld for taxes 131,182 118,908 132,289    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 185,808 188,973 180,747    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 11.51 $ 11.16 $ 11.61 $ 12.12  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instrument Other than Option, Nonvested, Intrinsic Value $ 15.22        
Share-based compensation liability $ 3.5        
Employee Stock [Member]          
Number of shares authorized under a Plan     5,800,000    
Shares available for future grants under a Plan 2,254,023        
Price for shares offered under ESPP, as a percentage of closing price on the first or last day of the offering period 85.00%        
Performance Shares [Member]          
Settlement of performance-based restricted stock units, net of shares withheld for taxes 103,058,000,000 93,647      
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years        
Settlement of performance-based restricted stock units, net of shares withheld for taxes 228,121 295,241 259,107    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 220,795 301,979 233,830    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 11.78 $ 11.41 $ 11.31 $ 12.14  
Minimum [Member] | Performance Shares [Member]          
Performance Factor 0.00%        
Maximum [Member] | Performance Shares [Member]          
Performance Factor 200.00%