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Borrowing Arrangements (Tables)
3 Months Ended
Dec. 31, 2022
Long-Term Debt and Lease Obligation [Abstract]  
Components of Long-Term Debt
The components of our long-term debt are as follows:
 December 31,September 30,
 20222022
 (in millions)
4.0% Senior Notes$450.0 $450.0 
Finance leases1.4 1.6 
Total borrowings451.4 451.6 
Less: deferred financing costs(4.4)(4.7)
Less: current portion(0.9)(0.8)
Long-term debt$446.1 $446.1