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Borrowing Arrangements (Tables)
6 Months Ended
Mar. 31, 2025
Long-Term Debt and Lease Obligation [Abstract]  
Components of Long-Term Debt
The components of our long-term debt are as follows:
 March 31,September 30,
 20252024
 (in millions)
4.0% Senior Notes$450.0 $450.0 
Finance leases3.3 2.7 
Total debt453.3 452.7 
Less: deferred financing costs2.8 3.2 
Less: current portion of long-term debt1.0 0.8 
Long-term debt$449.5 $448.7