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Commitment and Contingencies (Tables)
 12 Months Ended
Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Expected Payments for Environmental Remediation Based on current estimates, the expected payments for environmental remediation for the next five years and thereafter at September 30, 2023 are as follows:
(in millions)
Amount
2024$1.6 
20252.4 
20260.4 
20270.3 
20280.3 
Thereafter
1.6 
Total payments6.6 
Amount representing interest(1.2)
Total environmental obligation$5.4