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Long-Term Debt (Tables)
6 Months Ended
Mar. 31, 2023
Debt Disclosure [Abstract]  
Long-term Debt
March 31,
2023
September 30,
2022
7.00% Senior Notes maturing in March 2030$840.0 $840.0 
Revolving Credit Facility139.0 99.0 
Total principal amount of debt979.0 939.0 
Less: Debt issuance costs, net8.9 9.5 
Long-term debt$970.1 $929.5