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Leases, Codification Topic 842 (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Lessee, Lease, Description [Line Items]      
Operating Lease, Expense $ 6.3 $ 5.8 $ 6.4
Finance Lease, Right-of-Use Asset, Amortization 1.3 1.0 0.8
Total lease expense 7.6 6.8 $ 7.2
Operating Lease, Payments 6.1    
Finance Lease, Principal Payments 1.3    
Operating Lease, Right-of-Use Asset 25.6 0.0  
Finance Lease, Right-of-Use Asset, after Accumulated Amortization 2.5    
Total Right of Use Assets 28.1    
Operating lease liability 4.0 0.0  
Operating Lease, Liability, Noncurrent 23.3 $ 0.0  
Finance Lease, Liability, Current 1.1    
Finance Lease, Liability, Noncurrent 1.4    
Total Lease Liabilities $ 29.8    
Operating Lease, Weighted Average Remaining Lease Term 7 years 10 months 13 days    
Finance Lease, Weighted Average Remaining Lease Term 2 years 6 months 7 days    
Operating Lease, Weighted Average Discount Rate, Percent 5.64%    
Finance Lease, Weighted Average Discount Rate, Percent 4.96%    
Lessee, Operating Lease, Liability, to be Paid, Year One $ 5.5    
Lessee, Operating Lease, Liability, to be Paid, Year Two 4.8    
Lessee, Operating Lease, Liability, to be Paid, Year Three 4.3    
Lessee, Operating Lease, Liability, to be Paid, Year Four 4.1    
Lessee, Operating Lease, Liability, to be Paid, Year Five 3.7    
Lessee, Operating Lease, Liability, to be Paid, after Year Five 12.5    
Lessee, Operating Lease, Liability, to be Paid 34.9    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount 7.6    
Operating Lease, Liability 27.3    
Finance Lease, Liability, to be Paid, Year One 1.2    
Finance Lease, Liability, to be Paid, Year Two 0.9    
Finance Lease, Liability, to be Paid, Year Three 0.5    
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 2.7    
Finance Lease, Liability, Undiscounted Excess Amount 0.2    
Finance Lease, Liability $ 2.5    
Schedule of Cash Flow, Supplemental Disclosures
Supplemental cash flow information is presented below.
202020192018
 (in millions)
Cash paid, net:
Interest$24.3 $22.2 $8.9 
Income taxes$15.3 $29.1 $10.7