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Borrowing Arrangements (Tables)
6 Months Ended
Mar. 31, 2024
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,
 20242023
 (in millions)
4.0% Senior Notes$450.0 $450.0 
Finance leases2.3 1.3 
Total debt452.3 451.3 
Less: deferred financing costs3.6 3.9 
Less: current portion of long-term debt0.7 0.7 
Long-term debt$448.0 $446.7