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Commitments and Contingencies - Narrative (Details) $ in Millions				12 Months Ended
	Nov. 14, 2022 USD ($)	Feb. 28, 2022 USD ($)	Feb. 02, 2021 plaintiff	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Loss Contingencies [Line Items]
Option to extend lease period				14 years
Period of options to terminate lease				1 year
Lease impairment charges				$ 132.0	$ 31.0	$ 120.0
Litigation settlement, amount awarded to other party	$ 2.5
Basis Capital Investment Group, Investment Losses On Collateralized Debt Obligations
Loss Contingencies [Line Items]
Loss contingency, number of plaintiffs | plaintiff			2
IHS Markit Ltd
Loss Contingencies [Line Items]
Right-of-use asset obtained in business acquisition		$ 230.0
Operating lease liability incurred in business acquisition		$ 268.0
Minimum
Loss Contingencies [Line Items]
Remaining lease terms				1 year
Maximum
Loss Contingencies [Line Items]
Remaining lease terms				11 years
CME Group
Loss Contingencies [Line Items]
Noncontrolling interest ownership by noncontrolling owners (as a percent)				27.00%
S&P/DJ Indices | CME Group
Loss Contingencies [Line Items]
Noncontrolling interest ownership by noncontrolling owners (as a percent)				27.00%
S&P/DJ Indices | CME Group
Loss Contingencies [Line Items]
Revenues earned under license agreement				$ 170.0	$ 139.0	$ 149.0

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