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Borrowing Arrangements (Tables)
3 Months Ended
Dec. 31, 2024
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,
 20242024
 (in millions)
4.0% Senior Notes$450.0 $450.0 
Finance leases2.5 2.7 
Total debt452.5 452.7 
Less: deferred financing costs3.0 3.2 
Less: current portion of long-term debt0.8 0.8 
Long-term debt$448.7 $448.7