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Long-Term Debt (Tables)
3 Months Ended
Dec. 31, 2024
Debt Disclosure [Abstract]  
Long-term Debt
December 31,
2024
September 30,
2024
7.00% senior notes maturing in March 2030840.0 840.0 
Less: Debt issuance costs, net6.6 6.9 
Long-term debt$833.4 $833.1