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Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reconciliation of cash, cash equivalents, and restricted cash and cash equivalents:
Cash and cash equivalents	$ 432.7	$ 341.9	$ 245.4
Restricted cash and cash equivalents (included in margin deposits and clearing funds)	530.3	745.9	812.1
Restricted cash and cash equivalents (included in other current assets)	4.2	4.4
Customer bank deposits (included in margin deposits and clearing funds)	12.7
Total	$ 979.9	$ 1,092.2	$ 1,057.5
Margin deposits and clearing funds
Reconciliation of cash, cash equivalents, and restricted cash and cash equivalents:
Restricted Cash and Cash Equivalents, Statement of Financial Position [Extensible Enumeration]	Margin Deposits And Clearing Funds, Assets	Margin Deposits And Clearing Funds, Assets	Margin Deposits And Clearing Funds, Assets
Other current assets
Reconciliation of cash, cash equivalents, and restricted cash and cash equivalents:
Restricted Cash and Cash Equivalents, Statement of Financial Position [Extensible Enumeration]	Other Assets, Current	Other Assets, Current	Other Assets, Current

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