CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 141.2	$ 138.5	$ 262.5	$ 278.3
Other comprehensive (loss) income:
Pension and other postretirement adjustments, net of tax	(0.2)	(0.9)	(0.3)	(0.5)
Cumulative translation adjustment	(6.0)	2.3	(70.3)	38.9
Other comprehensive (loss) income	(6.2)	1.4	(70.6)	38.4
Comprehensive income	135.0	139.9	191.9	316.7
Comprehensive loss attributable to noncontrolling interest	0.1	0.1	0.2	0.1
Comprehensive income attributable to IDEX	$ 135.1	$ 140.0	$ 192.1	$ 316.8