CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 47.9	$ 33.0	$ 93.5	$ 70.3
Other comprehensive income (loss):
Net foreign currency translation adjustment	42.5	(14.4)	61.7	12.8
Net change in postretirement benefit plans, net of tax impacts of $0.4, $0.4, $0.9 and $1.0, respectively	1.2	1.2	2.3	2.3
Other comprehensive income (loss)	43.7	(13.2)	64.0	15.1
Comprehensive income	91.6	19.8	157.5	85.4
Less: Comprehensive income (loss) attributable to noncontrolling interests	0.1	0.2	(0.3)	0.1
Comprehensive income attributable to ITT Inc.	91.5	19.6	157.8	85.3
Reclassification adjustments (see Note 14):
Amortization of prior service benefit, net of tax expense of $(0.5), $(0.5), $(1.0) and $(1.0), respectively	(0.7)	(0.9)	(1.4)	(1.8)
Amortization of net actuarial loss, net of tax benefits of $0.9,$0.9, $1.9 and $2.0, respectively	1.9	2.1	3.7	4.1
Net change in postretirement benefit plans, net of tax impacts of $0.4, $0.4, $0.9 and $1.0, respectively	$ 1.2	$ 1.2	$ 2.3	$ 2.3