CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 90.2	$ 130.7	$ 160.5	$ 315.1
Other comprehensive income (loss):
Net foreign currency translation adjustment	4.3	(24.4)	17.1	(72.2)
Net change in postretirement benefit plans, net of tax impacts of $0.6, $0.1, $1.6 and $0.5, respectively	1.2	0.8	3.5	1.9
Other comprehensive income (loss)	5.5	(23.6)	20.6	(70.3)
Comprehensive income	95.7	107.1	181.1	244.8
Less: Comprehensive income attributable to noncontrolling interests	0.1	0.0	0.2	0.0
Comprehensive income attributable to ITT Inc.	95.6	107.1	180.9	244.8
Reclassification adjustments (see Note 14):
Amortization of prior service benefit, net of tax expense of $(0.6), $(1.2), $(1.6) and $(3.0), respectively	(0.8)	(1.4)	(2.6)	(4.6)
Amortization of net actuarial loss, net of tax benefits of $1.2, $1.3, $3.2 and $3.5, respectively	2.0	2.2	6.1	6.5
Net change in postretirement benefit plans, net of tax impacts of $0.6, $0.1, $1.6 and $0.5, respectively	$ 1.2	$ 0.8	$ 3.5	$ 1.9