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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Statement of Comprehensive Income [Abstract]    
Net income $ 95.4 $ 121.3
Other comprehensive income (loss):    
Pension and other postretirement adjustments, net of tax (0.2) (0.1)
Cumulative translation adjustment 53.9 (64.3)
Other comprehensive income (loss), net of tax 53.7 (64.4)
Comprehensive income 149.1 56.9
Comprehensive loss attributable to noncontrolling interest 0.1 0.1
Comprehensive income attributable to IDEX $ 149.2 $ 57.0