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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Net income $ 2,636.9 $ 2,106.4 $ 2,115.8
Net unrealized holding gains (losses) arising during the period (1.0) 1.1 1.0
Reclassification of gains(loss) on sale included in investment income 0.3 0.0 0.0
Income tax benefit (expense) 0.2 (0.3) (0.3)
Investment securities, net (0.5) 0.8 0.7
Net change in defined benefit plans arising during the period 25.5 (7.4) (6.6)
Amortization of net actuarial (gains) losses and prior service costs included in compensation and benefits expense 4.4 4.7 4.9
Income tax benefit (expense) (7.6) 0.7 0.4
Defined benefit plans, net 22.3 (2.0) (1.3)
Net unrealized holding gains (losses) arising during the period 0.0 0.0 0.6
Amortization of effective portion of net (gains) losses on cash flow hedges included in interest expense (1.2) (2.7) (1.2)
Income tax benefit (expense) 0.3 0.7 (0.1)
Derivative investments, net (0.9) (2.0) (0.7)
Foreign currency translation adjustments (62.0) 134.3 (0.6)
Reclassification adjustment for loss included in other expense (40.3) 0.4 0.0
Foreign currency translation, net (102.3) 134.7 (0.6)
Other comprehensive income/(loss) (81.4) 131.5 (1.9)
Comprehensive income 2,555.5 2,237.9 2,113.9
Less: comprehensive (income) loss attributable to non-controlling interest (0.5) (1.2) 0.7
Comprehensive income attributable to CME Group $ 2,555.0 $ 2,236.7 $ 2,114.6