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Borrowing Arrangements (Tables)
12 Months Ended
Sep. 30, 2022
Long-Term Debt and Lease Obligation [Abstract]  
Components of Long-Term Debt
The components of our long-term debt are as follows:
 September 30,
 20222021
 (in millions)
4.0% Senior Notes$450.0 $450.0 
Finance leases1.6 2.2 
Total debt451.6 452.2 
Less deferred financing costs(4.7)(5.3)
Less current portion of long-term debt(0.8)(1.0)
Long-term debt$446.1 $445.9