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Condensed Consolidated Statements of Cash Flows (Parentheticals) - USD ($)
$ in Millions
Sep. 30, 2021
Sep. 30, 2020
Reconciliation of cash, cash equivalents, and restricted cash and cash equivalents    
Cash and cash equivalents $ 392.4 $ 212.7
Total 2,062.4 984.6
Margin deposits and clearing funds    
Reconciliation of cash, cash equivalents, and restricted cash and cash equivalents    
Restricted cash and cash equivalents 1,665.6 $ 771.9
Other current assets    
Reconciliation of cash, cash equivalents, and restricted cash and cash equivalents    
Restricted cash and cash equivalents $ 4.4