CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 02, 2022	Jul. 03, 2021	Jul. 02, 2022	Jul. 03, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 74.8	$ 39.2	$ 150.1	$ 125.7
Other comprehensive (loss) income:
Net foreign currency translation adjustment	(70.8)	8.4	(82.5)	(21.6)
Net change in postretirement benefit plans, net of tax expense of $(0.2), $(0.1), $(0.3) and $(0.2), respectively	(0.2)	0.0	(0.5)	0.0
Other comprehensive (loss) income	(71.0)	8.4	(83.0)	(21.6)
Comprehensive income	3.8	47.6	67.1	104.1
Less: Comprehensive income attributable to noncontrolling interests	0.2	0.2	0.7	0.5
Comprehensive income attributable to ITT Inc.	3.6	47.4	66.4	103.6
Reclassification adjustments:
Amortization of prior service benefit, net of tax expense of $(0.3), $(0.3), $(0.6) and $(0.6), respectively	(0.9)	(0.9)	(1.9)	(1.9)
Amortization of net actuarial loss, net of tax benefit of $0.1, $0.2, $0.3 and $0.4, respectively	0.7	0.9	1.4	1.9
Net change in postretirement benefit plans, net of tax	$ 0.2	$ 0.0	$ 0.5	$ 0.0