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Consolidated Statements of Cash Flows (Parentheticals) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of cash, cash equivalents, and restricted cash and cash equivalents      
Cash and cash equivalents $ 341.9 $ 245.4 $ 229.3
Total 1,092.2 1,057.5 229.3
Margin deposits and clearing funds      
Reconciliation of cash, cash equivalents, and restricted cash and cash equivalents      
Restricted cash and cash equivalents 745.9 $ 812.1
Other current assets      
Reconciliation of cash, cash equivalents, and restricted cash and cash equivalents      
Restricted cash and cash equivalents $ 4.4