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Leases, Codification Topic 842 (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Lessee, Lease, Description [Line Items]      
Operating Lease, Expense $ 6.3 $ 5.8 $ 6.1
Finance Lease, Right-of-Use Asset, Amortization 1.1 1.3 1.2
Total lease expense 7.4 7.1 7.3
Operating Lease, Payments 6.4 5.8  
Finance Lease, Principal Payments 1.1 0.7 $ (0.4)
Operating Lease, Right-of-Use Asset 23.6 26.0  
Finance Lease, Right-of-Use Asset, after Accumulated Amortization 1.2 1.4  
Total Right of Use Assets 24.8 27.4  
Operating lease liability 4.9 4.4  
Operating Lease, Liability, Noncurrent 19.8 22.4  
Finance Lease Liability, Current 0.7 0.8  
Finance Lease, Liability, Noncurrent 0.6 0.8  
Total Lease Liabilities $ 26.0 $ 28.4  
Operating Lease, Weighted Average Remaining Lease Term 5 years 9 months 21 days 6 years 8 months 1 day  
Finance Lease, Weighted Average Remaining Lease Term 2 years 2 months 26 days 2 years 1 month 24 days  
Operating Lease, Weighted Average Discount Rate, Percent 5.51% 5.48%  
Finance Lease, Weighted Average Discount Rate, Percent 4.69% 3.64%  
Lessee, Operating Lease, Liability, to be Paid, Year One $ 6.2    
Lessee, Operating Lease, Liability, to be Paid, Year Two 5.7    
Lessee, Operating Lease, Liability, to be Paid, Year Three 5.2    
Lessee, Operating Lease, Liability, to be Paid, Year Four 4.3    
Lessee, Operating Lease, Liability, to be Paid, Year Five 2.7    
Lessee, Operating Lease, Liability, to be Paid, after Year Five 4.9    
Lessee, Operating Lease, Liability, to be Paid 29.0    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (4.3)    
Operating Lease, Liability 24.7    
Finance Lease, Liability, to be Paid, Year One 0.7    
Finance Lease, Liability, to be Paid, Year Two 0.4    
Finance Lease, Liability, to be Paid, Year Three 0.2    
Finance Lease, Liability, to be Paid, Year Four 0.1    
Finance Lease, Liability, to be Paid, Year Five 0.0    
Finance Lease, Liability, to be Paid, after Year Five 0.0    
Finance Lease, Liability, Payment, Due 1.4    
Finance Lease, Liability, Undiscounted Excess Amount (0.1)    
Finance Lease, Liability $ 1.3