CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2024	Apr. 01, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 112.0	$ 100.7
Other comprehensive (loss) income:
Net foreign currency translation adjustment	(32.1)	6.0
Net change in postretirement benefit plans, net of tax impacts of $0.3, $1.8, respectively	(1.0)	0.4
Other comprehensive (loss) income	(33.1)	6.4
Comprehensive income	78.9	107.1
Less: Comprehensive income attributable to noncontrolling interests	1.0	0.7
Comprehensive income attributable to ITT Inc.	77.9	106.4
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [Abstract]
Amortization of prior service benefit, net of tax expense of $0.3, $0.3, respectively	(1.1)	(1.2)
Amortization of net actuarial loss, net of tax benefit of $0.0, $0.0, respectively	0.1	0.1
Other Adjustments [Abstract]
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	0.0	1.5
Net change in postretirement benefit plans, net of tax	$ 1.0	$ (0.4)