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Long-Term Debt (Tables)
9 Months Ended
Jun. 30, 2025
Debt Disclosure [Abstract]  
Long-term Debt
June 30,
2025
September 30,
2024
7.00% senior notes maturing in March 2030
$840.0 $840.0 
Revolving Credit Facility175.0 — 
Total principal amount of debt
$1,015.0 $840.0 
Less: Debt issuance costs, net6.0 6.9 
Long-term debt$1,009.0 $833.1