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Borrowing Arrangements (Tables)
6 Months Ended
Mar. 31, 2022
Long-term Debt and Lease Obligation [Abstract]  
Components of Long-Term Debt The components of our long-term debt are as follows:
 March 31,September 30,
 20222021
 (in millions)
4.0% Senior Notes$450.0 $450.0 
Finance leases2.1 2.2 
Total borrowings452.1 452.2 
Less deferred financing costs(5.0)(5.3)
Less current portion(1.0)(1.0)
Long-term debt$446.1 $445.9