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Borrowing Arrangements (Tables)
3 Months Ended
Dec. 31, 2020
Long-term Debt and Lease Obligation [Abstract]  
Components of Long-Term Debt
The components of our long-term debt are presented below.
 December 31,September 30,
 20202020
 (in millions)
5.5% Senior Notes$450.0 $450.0 
Finance leases2.4 2.5 
452.4 452.5 
Less deferred financing costs4.7 4.9 
Less current portion1.1 1.1 
Long-term debt$446.6 $446.5