CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 01, 2022	Oct. 02, 2021	Oct. 01, 2022	Oct. 02, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 103.2	$ 88.0	$ 253.3	$ 213.7
Other comprehensive (loss):
Net foreign currency translation adjustment	(44.6)	(21.5)	(127.1)	(43.1)
Net change in postretirement benefit plans, net of tax expense of $3.4, $0.8, $3.1 and $0.6, respectively	11.4	3.1	10.9	3.1
Other comprehensive (loss)	(33.2)	(18.4)	(116.2)	(40.0)
Comprehensive income	70.0	69.6	137.1	173.7
Less: Comprehensive income attributable to noncontrolling interests	0.8	0.5	1.5	1.0
Comprehensive income attributable to ITT Inc.	69.2	69.1	135.6	172.7
Reclassification adjustments:
Amortization of prior service benefit, net of tax expense of $(0.3), $(0.2), $(0.9) and $(0.8), respectively	(1.1)	(0.7)	(3.0)	(2.6)
Amortization of net actuarial loss, net of tax benefit of $0.1, $0.1, $0.4 and $0.5, respectively	0.7	0.9	2.1	2.8
Other Adjustments [Abstract]
Net actuarial gain, net of tax expense of $1.8, $0.9, $1.8 and $0.9, respectively	5.7	2.9	5.7	2.9
Prior service credit, net of tax expense of $1.9, $0.0, $1.9, and $0.0, respectively	6.1	0.0	6.1	0.0
Net change in postretirement benefit plans, net of tax	$ (11.4)	$ (3.1)	$ (10.9)	$ (3.1)