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Leases - Balance Sheet Information (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Sep. 30, 2024
Finance Leases    
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Property, Plant and Equipment, Net Property, Plant and Equipment, Net
Total Finance Lease Assets $ 28.9 $ 30.8
Current finance lease liabilities 3.4 3.4
Non Current Finance Lease Liabilities 29.1 30.2
Total Finance Lease Liabilities $ 32.5 $ 33.6
Weighted-average remaining lease term (years) 11 years 9 months 18 days 12 years 6 months
Weighted-average discount rate 6.80% 6.80%
Operating Leases    
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Deferred Income Taxes and Other Assets Deferred Income Taxes and Other Assets
Total Operating Lease Assets $ 20.3 $ 22.6
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Accrued expenses Accrued expenses
Accrued expenses $ 6.1 $ 6.0
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Deferred Income Taxes and Other Liabilities Deferred Income Taxes and Other Liabilities
Deferred Income Taxes and Other Liabilities $ 10.7 $ 11.9
Total Operating Lease Liabilities $ 16.8 $ 17.9
Weighted-average remaining lease term (years) 6 years 6 years 3 months 18 days
Weighted-average discount rate 6.80% 6.50%