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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Statement of Comprehensive Income [Abstract]    
Net Income $ 711.0 $ 574.8
Other comprehensive income (loss), net of tax:    
Net unrealized holding gains (losses) arising during the period (1.3) (1.1)
Income tax benefit (expense) 0.3 0.3
Investment securities, net (1.0) (0.8)
Net change in defined benefit plans arising during the period (3.7) 0.0
Amortization of net actuarial (gains) losses included in compensation and benefits expense 0.3 1.1
Income tax benefit (expense) 0.9 (0.3)
Defined benefit plans, net (2.5) 0.8
Reclassification of net unrealized (gains) losses to interest expense and other non-operating income (expense) 0.8 (0.3)
Income tax benefit (expense) (0.2) 0.1
Derivative investments, net 0.6 (0.2)
Foreign currency translation adjustments (22.6) (51.2)
Foreign currency translation, net (22.6) (51.2)
Other comprehensive income (loss), net of tax (25.5) (51.4)
Comprehensive income 685.5 523.4
Less: comprehensive (income) loss attributable to non-controlling interests 0.0 (0.4)
Comprehensive income attributable to CME Group $ 685.5 $ 523.0