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Long-Term Debt (Tables)
9 Months Ended
Jun. 30, 2023
Debt Disclosure [Abstract]  
Long-term Debt
June 30,
2023
September 30,
2022
7.00% Senior Notes maturing in March 2030$840.0 $840.0 
Revolving Credit Facility79.0 99.0 
Total principal amount of debt919.0 939.0 
Less: Debt issuance costs, net8.5 9.5 
Long-term debt$910.5 $929.5