Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of cash, cash equivalents, and restricted cash and cash equivalents:
Cash and cash equivalents	$ 543.2	$ 432.7	$ 341.9
Total	1,397.1	979.9	1,092.2
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, clearing funds, and interoperability funds)	$ 834.8	$ 530.3	$ 745.9
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
Customer bank deposits (included in margin deposits, clearing funds, and interoperability funds)	$ 14.0	$ 12.7
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
Restricted cash and cash equivalents (included in other current assets)	$ 5.1	$ 4.2	$ 4.4

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