CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (46.3)	$ 118.7	$ 86.8	$ 257.1
Other comprehensive income (loss):
Net foreign currency translation adjustment	23.5	(34.4)	(25.7)	(31.5)
Net change in postretirement benefit plans, net of tax benefits of $0.6, $0.7, $1.2 and $1.1, respectively	1.8	2.3	3.6	3.4
Other comprehensive income (loss)	25.3	(32.1)	(22.1)	(28.1)
Comprehensive (loss) income	(21.0)	86.6	64.7	229.0
Less: Comprehensive income attributable to noncontrolling interests	0.5	0.1	0.8	0.4
Comprehensive (loss) income attributable to ITT Inc.	(21.5)	86.5	63.9	228.6
Reclassification adjustments (see Note 15):
Amortization of prior service benefit, net of tax expense of $(0.3), $(0.3), $(0.9) and $(0.8), respectively	(1.0)	(0.8)	(2.9)	(2.5)
Amortization of net actuarial loss, net of tax benefits of $0.6, $0.5, $1.8 and $1.4, respectively	1.8	1.4	5.5	4.2
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	1.0	1.7	1.0	1.7
Net change in postretirement benefit plans, net of tax benefits of $0.6, $0.7, $1.2 and $1.1, respectively	$ 1.8	$ 2.3	$ 3.6	$ 3.4