CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 413.8	$ 369.4	$ 321.0
Other comprehensive income (loss):
Net foreign currency translation adjustment	17.6	(67.4)	(57.0)
Net change in postretirement benefit plans, net of tax	(5.2)	44.4	15.1
Other comprehensive (loss) income	12.4	(23.0)	(41.9)
Comprehensive income	426.2	346.4	279.1
Less: Comprehensive income attributable to noncontrolling interests	3.3	2.4	4.7
Comprehensive income attributable to ITT Inc.	422.9	344.0	274.4
Disclosure of reclassification adjustments and other adjustments to postretirement benefit plans (See Note 16)
Amortization of prior service benefit, net of tax expense of $1.4, $1.3, and $1.2, respectively	(4.6)	(4.2)	(3.9)
Amortization of net actuarial loss, net of tax benefit of $—, $(0.5), and $(0.7), respectively	0.1	2.6	3.7
Prior service cost, net of tax expense of $—, $(1.9), and $—, respectively	0.0	6.2	0.0
Net actuarial (loss) gain, net of tax benefit (expense) of $0.3, $(6.5), and $(2.0), respectively	(0.5)	38.1	12.6
Unrealized change from foreign currency translation	(0.2)	1.7	2.7
Net change in postretirement benefit plans, net of tax	$ 5.2	$ (44.4)	$ (15.1)