CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 86.5	$ 85.1
Other comprehensive loss:
Net foreign currency translation adjustment	(30.0)	(51.3)
Net change in postretirement benefit plans, net of tax (expense) benefits of $(0.1) and $0.3, respectively	0.0	0.9
Other comprehensive loss	(30.0)	(50.4)
Comprehensive income	56.5	34.7
Less: Comprehensive income attributable to noncontrolling interests	0.3	0.3
Comprehensive income attributable to ITT Inc.	56.2	34.4
Reclassification adjustments (see Note 15):
Amortization of prior service benefit, net of tax expense of $(0.3) and $(0.3), respectively	(1.0)	(0.9)
Amortization of net actuarial loss, net of tax benefits of $0.2 and $0.6, respectively	1.0	1.8
Net change in postretirement benefit plans, net of tax (expense) benefits of $(0.1) and $0.3, respectively	$ 0.0	$ 0.9