CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 48.0	$ 67.0	$ 133.1	$ 138.4
Other comprehensive income (loss):
Net foreign currency translation adjustment	2.1	5.3	(49.2)	2.9
Net change in postretirement benefit plans, net of tax benefits of $0.3, $0.2, $0.6 and $0.4, respectively	0.9	0.5	1.8	1.1
Other comprehensive income (loss)	3.0	5.8	(47.4)	4.0
Comprehensive income	51.0	72.8	85.7	142.4
Less: Comprehensive income attributable to noncontrolling interests	0.0	0.2	0.3	0.3
Comprehensive income attributable to ITT Inc.	51.0	72.6	85.4	142.1
Reclassification adjustments (see Note 15):
Amortization of prior service benefit, net of tax expense of $(0.3), $(0.2), $(0.6) and $(0.5), respectively	(1.0)	(0.9)	(1.9)	(1.7)
Amortization of net actuarial loss, net of tax benefits of $0.6, $0.4, $1.2 and $0.9, respectively	1.9	1.4	3.7	2.8
Net change in postretirement benefit plans, net of tax benefits of $0.3, $0.2, $0.6 and $0.4, respectively	$ 0.9	$ 0.5	$ 1.8	$ 1.1