CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 586.7	$ 449.3	$ 377.8
Other comprehensive (loss) income:
Reclassification adjustments for derivatives, net of tax	0.0	2.5	4.6
Pension and other postretirement adjustments, net of tax	18.3	17.0	1.4
Cumulative translation adjustment	(74.9)	(75.6)	107.8
Other comprehensive (loss) income	(56.6)	(56.1)	113.8
Comprehensive income	530.1	393.2	491.6
Comprehensive loss attributable to noncontrolling interest	0.2	0.0	0.0
Comprehensive income attributable to IDEX	$ 530.3	$ 393.2	$ 491.6