CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 71.4	$ 101.3
Other comprehensive (loss) income:
Net foreign currency translation adjustment	(2.4)	26.5
Net change in postretirement benefit plans, net of tax benefits of $0.2 and $0.4, respectively	0.6	1.1
Other comprehensive (loss) income	(1.8)	27.6
Comprehensive income	69.6	128.9
Less: Comprehensive income attributable to noncontrolling interests	0.1	0.1
Comprehensive income attributable to ITT Inc.	69.5	128.8
Reclassification adjustments (see Note 15):
Amortization of prior service benefit, net of tax expense of $(0.3) and $(0.2), respectively	(0.8)	(0.9)
Amortization of net actuarial loss, net of tax benefits of $0.5 and $0.6, respectively	1.4	2.0
Net change in postretirement benefit plans, net of tax benefits of $0.2 and $0.4, respectively	$ 0.6	$ 1.1