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Long-Term Debt (Tables)
9 Months Ended
Jun. 30, 2024
Debt Disclosure [Abstract]  
Long-term Debt
June 30,
2024
September 30,
2023
7.00% senior notes maturing in March 2030
$840.0 $840.0 
Revolving Credit Facility— 25.0 
Total principal amount of debt840.0 865.0 
Less: Debt issuance costs, net7.3 8.2 
Long-term debt$832.7 $856.8