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Borrowing Arrangements (Tables)
9 Months Ended
Jun. 30, 2023
Long-Term Debt and Lease Obligation [Abstract]  
Components of Long-Term Debt
The components of our long-term debt are as follows:
 June 30,September 30,
 20232022
 (in millions)
4.0% Senior Notes$450.0 $450.0 
Finance leases1.6 1.6 
Total borrowings451.6 451.6 
Less: deferred financing costs4.1 4.7 
Less: current portion of long-term debt0.8 0.8 
Long-term debt$446.7 $446.1