CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Apr. 01, 2023	Apr. 02, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 100.7	$ 75.3
Other comprehensive income (loss):
Net foreign currency translation adjustment	6.0	(11.7)
Net change in postretirement benefit plans, net of tax impacts of $1.8 and $0.2, respectively	0.4	(0.3)
Other comprehensive income (loss)	6.4	(12.0)
Comprehensive income	107.1	63.3
Less: Comprehensive income attributable to noncontrolling interests	0.7	0.5
Comprehensive income attributable to ITT Inc.	106.4	62.8
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 and $0.3, respectively	(1.2)	(1.0)
Amortization of net actuarial loss, net of tax benefit of $0.0 and $0.1, respectively	0.1	0.7
Other Adjustments [Abstract]
Deferred tax asset valuation allowance reversal	1.5	0.0
Net change in postretirement benefit plans, net of tax	$ (0.4)	$ 0.3