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Long-Term Debt (Tables)
12 Months Ended
Sep. 30, 2025
Debt Disclosure [Abstract]  
Long-term Debt
September 30,
20252024
7.00% Senior Notes maturing in March 2030$840.0 $840.0 
Revolving Credit Facility250.0 — 
   Total principal amount of debt1,090.0 840.0 
Less: Debt issuance costs, net5.7 6.9 
Long-term debt$1,084.3 $833.1