CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 118.7	$ 111.1	$ 257.1	$ 282.3
Other comprehensive loss:
Net foreign currency translation adjustment	(34.4)	(5.0)	(31.5)	(25.6)
Net change in postretirement benefit plans, net of tax benefits of $0.7, $1.2, $1.1 and $2.0, respectively	2.3	3.9	3.4	6.1
Other comprehensive loss	(32.1)	(1.1)	(28.1)	(19.5)
Comprehensive income	86.6	110.0	229.0	262.8
Less: Comprehensive income attributable to noncontrolling interests	0.1	0.2	0.4	0.5
Comprehensive income attributable to ITT Inc.	86.5	109.8	228.6	262.3
Reclassification adjustments (see Note 16):
Amortization of prior service benefit, net of tax expense of $(0.3), $(0.3), $(0.8) and $(0.8), respectively	(0.8)	(0.8)	(2.5)	(2.5)
Amortization of net actuarial loss, net of tax benefits of $0.5, $0.6, $1.4 and $1.9, respectively	1.4	1.8	4.2	5.7
Loss from plan settlement, net of tax benefit of $0.0, $0.3, $0.0 and $0.3, respectively	0.0	1.1	0.0	1.1
Net actuarial gain, net of tax expense of $0.5, $0.6, $0.5 and $0.6, respectively	1.7	1.8	1.7	1.8
Net change in postretirement benefit plans, net of tax benefits of $0.7, $1.2, $1.1 and $2.0, respectively	$ 2.3	$ 3.9	$ 3.4	$ 6.1