CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 86.9	$ 90.2	$ 180.4	$ 160.5
Other comprehensive income (loss):
Net foreign currency translation adjustment	22.7	4.3	84.4	17.1
Net change in postretirement benefit plans, net of tax impacts of $2.1, $0.6, $3.0 and $1.6, respectively	3.6	1.2	5.9	3.5
Other comprehensive income	26.3	5.5	90.3	20.6
Comprehensive income	113.2	95.7	270.7	181.1
Less: Comprehensive income (loss) attributable to noncontrolling interests	0.0	0.1	(0.3)	0.2
Comprehensive income attributable to ITT Inc.	113.2	95.6	271.0	180.9
Reclassification adjustments (see Note 14):
Amortization of prior service benefit, net of tax expense of $(0.3), $(0.6), $(1.3) and $(1.6), respectively	(0.9)	(0.8)	(2.3)	(2.6)
Amortization of net actuarial loss, net of tax benefits of $1.1, $1.2, $3.0 and $3.2, respectively	2.1	2.0	5.8	6.1
Loss from curtailment, net of tax benefit of $1.3, $0.0, $1.3 and $0.0, respectively	2.4	0.0	2.4	0.0
Net change in postretirement benefit plans, net of tax impacts of $2.1, $0.6, $3.0 and $1.6, respectively	$ 3.6	$ 1.2	$ 5.9	$ 3.5