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Commitment and Contingencies (Tables)
 12 Months Ended
Sep. 30, 2022
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Expected Payments for Enviromental Remediation Based on current estimates, the expected payments for environmental remediation for the next five years and thereafter at September 30, 2022 are as follows:
(in millions)
Amount
2023$5.0 
20242.6 
20250.4 
20260.3 
20270.2 
Thereafter
1.8 
Total payments10.3 
Amount representing interest(1.5)
Total environmental obligation$8.8