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Condensed Consolidated Statements of Cash Flows (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2023
Sep. 30, 2022
Reconciliation of cash, cash equivalents, and restricted cash and cash equivalents:    
Cash and cash equivalents $ 403.1 $ 353.3
Total 1,731.7 1,386.5
Margin deposits, clearing funds and interoperability funds    
Reconciliation of cash, cash equivalents, and restricted cash and cash equivalents:    
Restricted cash and cash equivalents (included in margin deposits and clearing funds) 1,308.9 1,010.4
Customer bank deposits (included in margin deposits and clearing funds) 15.8 18.9
Other current assets    
Reconciliation of cash, cash equivalents, and restricted cash and cash equivalents:    
Restricted cash and cash equivalents (included in other current assets) $ 3.9 $ 3.9