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Borrowing Arrangements (Tables)
9 Months Ended
Jun. 30, 2022
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,
 20222021
 (in millions)
4.0% Senior Notes$450.0 $450.0 
Finance leases1.8 2.2 
Total borrowings451.8 452.2 
Less deferred financing costs(4.8)(5.3)
Less current portion(0.9)(1.0)
Long-term debt$446.1 $445.9