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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Net income $ 3,226.2 $ 2,691.0 $ 2,636.9
Net unrealized holding gains (losses) arising during the period 0.6 (2.7) (1.0)
Reclassification of gains(loss) on sale included in investment income 0.0 0.0 0.3
Income tax benefit (expense) (0.1) 0.7 0.2
Investment securities, net 0.5 (2.0) (0.5)
Net change in defined benefit plans arising during the period (0.9) 14.9 25.5
Amortization of net actuarial (gains) losses and prior service costs included in compensation and benefits expense 0.1 1.2 4.4
Income tax benefit (expense) 0.2 (4.1) (7.6)
Defined benefit plans, net (0.6) 12.0 22.3
Amortization of effective portion of net (gains) losses on cash flow hedges included in interest expense (3.6) (1.9) (1.2)
Income tax benefit (expense) 0.9 0.5 0.3
Derivative investments, net (2.7) (1.4) (0.9)
Foreign currency translation adjustments 70.8 (195.4) (62.0)
Reclassification adjustment for (gain) loss included in other expense 9.7 0.0 (40.3)
Foreign currency translation, net 80.5 (195.4) (102.3)
Other comprehensive income/(loss) 77.7 (186.8) (81.4)
Comprehensive income 3,303.9 2,504.2 2,555.5
Less: comprehensive (income) loss attributable to non-controlling interest 0.0 0.0 (0.5)
Comprehensive income attributable to CME Group $ 3,303.9 $ 2,504.2 $ 2,555.0