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Long-Term Debt (Tables)
12 Months Ended
Sep. 30, 2024
Debt Disclosure [Abstract]  
Long-term Debt
September 30,
20242023
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, net6.9 8.2 
Long-term debt$833.1 $856.8