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Related Party Disclosures (Tables)
12 Months Ended
Sep. 30, 2021
Related Party Transactions [Abstract]  
Summary of Transaction Service Agreements The following table summarizes the TSA income and expenses during the years ended September 30, 2021, 2020 and 2019:
(in millions)202120202019
TSA income$0.9 $9.6 $19.1 
TSA expense2.6 13.5 13.9 
Net TSA (loss) income $(1.7)$(3.9)$5.2