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Retirement Plans (Narrative) (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items]          
Payment for Pension and Other Postretirement Benefits       $ 0.7  
Defined Benefit Plan, Amortization of Gain (Loss)     $ (2.5) (2.8) $ (1.9)
Defined Benefit Plan, Plan Assets, Contributions by Employer     0.0 0.1  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment     0.0 0.0 (0.7)
Payment for Pension Benefits     $ 0.0 $ 0.0 $ 0.7
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate     3.01% 2.84% 3.26%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage     100.00%    
Discount rate     2.84% 3.26% 4.37%
Defined Contribution Plan, Cost     $ 5.9 $ 5.3 $ 5.5
Minimum [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan Expected Return on Plan Assets Major Asset Classes Time Horizon     1000.00%    
Maximum [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan Expected Return on Plan Assets Major Asset Classes Time Horizon     1500.00%    
Equity Securities [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage     30.00%    
Equity Securities [Member] | Minimum [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage     25.00%    
Forecast [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Amortization of Gain (Loss)   $ (1.7)      
Pension Plan, Defined Benefit [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Payment for Pension and Other Postretirement Benefits $ 0.4        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment       $ 1.1