CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Revenue		$ 2,745.1	$ 2,585.3	$ 2,405.4
Costs of revenue		1,857.9	1,765.4	1,644.5
Gross profit		887.2	819.9	760.9
General and administrative expenses		259.1	258.4	260.5
Sales and marketing expenses		168.2	169.5	169.8
Research and development expenses		98.4	93.5	80.5
Gain on sale of long-lived assets		(40.7)	(0.9)	(0.9)
Asbestos-related expense (benefit), net		4.9	(19.9)	(25.6)
Operating income	[1]	397.3	319.3	276.6
Interest and non-operating expenses, net		6.3	9.9	18.2
Income from continuing operations before income tax		391.0	309.4	258.4
Income tax expense		57.7	194.6	76.0
Income from continuing operations		333.3	114.8	182.4
Income (loss) from discontinued operations, including tax (expense) benefit of $(0.3), $1.9, and $(0.3), respectively		1.3	(1.5)	4.2
Net income		334.6	113.3	186.6
Less: Income (loss) attributable to noncontrolling interests		0.9	(0.2)	0.5
Net income attributable to ITT Inc.		333.7	113.5	186.1
Amounts attributable to ITT Inc.:
Income from continuing operations, net of tax		332.4	115.0	181.9
Income (loss) from discontinued operations, including tax (expense) benefit of $(0.3), $1.9, and $(0.3), respectively		1.3	(1.5)	4.2
Net income attributable to ITT Inc.		$ 333.7	$ 113.5	$ 186.1
Basic earnings per share:
Continuing operations		$ 3.79	$ 1.30	$ 2.04
Discontinued operations		0.02	(0.01)	0.05
Net income		3.81	1.29	2.09
Diluted earnings per share:
Continuing operations		3.75	1.29	2.02
Discontinued operations		0.01	(0.01)	0.05
Net income		$ 3.76	$ 1.28	$ 2.07
Weighted average common shares – basic		87.7	88.3	89.2
Weighted average common shares – diluted		88.7	89.0	89.9

[1] (a)Operating income and operating margin for the years ended December 31, 2017 and 2016 has been restated to reflect the adoption of ASU 2017-07. Refer to Note 2, Recent Accounting Pronouncements for further information.