CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 69.9	$ 47.9	$ 171.2	$ 93.5
Other comprehensive (loss) income:
Net foreign currency translation adjustment	(47.1)	42.5	(20.6)	61.7
Net change in postretirement benefit plans, net of tax impacts of $0.4, $0.4, $0.8 and $0.9, respectively	1.1	1.2	2.2	2.3
Other comprehensive (loss) income	(46.0)	43.7	(18.4)	64.0
Comprehensive income	23.9	91.6	152.8	157.5
Less: Comprehensive income (loss) attributable to noncontrolling interests	0.2	0.1	0.3	(0.3)
Comprehensive income attributable to ITT Inc.	23.7	91.5	152.5	157.8
Reclassification adjustments (see Note 15):
Amortization of prior service benefit, net of tax expense of $(0.3), $(0.5), $(0.5) and $(1.0), respectively	(0.8)	(0.7)	(1.7)	(1.4)
Amortization of net actuarial loss, net of tax benefits of $0.7, $0.9, $1.3 and $1.9, respectively	1.9	1.9	3.9	3.7
Net change in postretirement benefit plans, net of tax impacts of $0.4, $0.4, $0.8 and $0.9, respectively	$ 1.1	$ 1.2	$ 2.2	$ 2.3