CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 67.0	$ 69.9	$ 138.4	$ 171.2
Other comprehensive income (loss):
Net foreign currency translation adjustment	5.3	(47.1)	2.9	(20.6)
Net change in postretirement benefit plans, net of tax benefits of $0.2, $0.4, $0.4 and $0.8, respectively	0.5	1.1	1.1	2.2
Other comprehensive income (loss)	5.8	(46.0)	4.0	(18.4)
Comprehensive income	72.8	23.9	142.4	152.8
Less: Comprehensive income attributable to noncontrolling interests	0.2	0.2	0.3	0.3
Comprehensive income attributable to ITT Inc.	72.6	23.7	142.1	152.5
Reclassification adjustments (see Note 15):
Amortization of prior service benefit, net of tax expense of $(0.2), $(0.3), $(0.5) and $(0.5), respectively	(0.9)	(0.8)	(1.7)	(1.7)
Amortization of net actuarial loss, net of tax benefits of $0.4, $0.7, $0.9 and $1.3, respectively	1.4	1.9	2.8	3.9
Net change in postretirement benefit plans, net of tax benefits of $0.2, $0.4, $0.4 and $0.8, respectively	$ 0.5	$ 1.1	$ 1.1	$ 2.2