Equity - Redeemable Noncontrolling Interests (Details)	9 Months Ended
	Sep. 30, 2025
Noncontrolling Interest [Line Items]
Minimum interest in joint venture (as a percent)	20.00%
Agreement terms, change of control, put option for minority interest ownership, effective period	15 days
CME Group
Noncontrolling Interest [Line Items]
Noncontrolling interest ownership by noncontrolling owners percentage	27.00%