CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 85.1	$ 71.4
Other comprehensive loss:
Net foreign currency translation adjustment	(51.3)	(2.4)
Net change in postretirement benefit plans, net of tax benefits of $0.3 and $0.2, respectively	0.9	0.6
Other comprehensive loss	(50.4)	(1.8)
Comprehensive income	34.7	69.6
Less: Comprehensive income attributable to noncontrolling interests	0.3	0.1
Comprehensive income attributable to ITT Inc.	34.4	69.5
Reclassification adjustments (see Note 15):
Amortization of prior service benefit, net of tax expense of $(0.3) and $(0.3), respectively	(0.9)	(0.8)
Amortization of net actuarial loss, net of tax benefits of $0.6 and $0.5, respectively	1.8	1.4
Net change in postretirement benefit plans, net of tax benefits of $0.3 and $0.2, respectively	$ 0.9	$ 0.6