CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Revenue	$ 2,585.3	$ 2,405.4	$ 2,485.6
Costs of revenue	1,768.1	1,647.2	1,676.5
Gross profit	817.2	758.2	809.1
General and administrative expenses	264.0	274.1	258.3
Sales and marketing expenses	169.7	170.0	183.2
Research and development expenses	93.7	80.8	78.9
Asbestos-related benefit, net	(19.9)	(25.6)	(91.4)
Operating income	309.7	258.9	380.1
Interest and non-operating expenses (income), net	0.3	0.5	(2.2)
Income from continuing operations before income tax	309.4	258.4	382.3
Income tax expense	194.6	76.0	70.1
Income from continuing operations	114.8	182.4	312.2
(Loss) income from discontinued operations, including tax benefit (expense) of $1.9, $(0.3), and $24.5, respectively	(1.5)	4.2	39.4
Net income	113.3	186.6	351.6
Less: (Loss) income attributable to noncontrolling interests	(0.2)	0.5	(0.2)
Net income attributable to ITT Inc.	113.5	186.1	351.8
Amounts attributable to ITT Inc.:
Income from continuing operations, net of tax	115.0	181.9	312.4
(Loss) income from discontinued operations, including tax benefit (expense) of $1.9, $(0.3), and $24.5, respectively	(1.5)	4.2	39.4
Net income attributable to ITT Inc.	$ 113.5	$ 186.1	$ 351.8
Basic earnings per share:
Continuing operations	$ 1.30	$ 2.04	$ 3.48
Discontinued operations	(0.01)	0.05	0.44
Net income	1.29	2.09	3.92
Diluted earnings per share:
Continuing operations	1.29	2.02	3.44
Discontinued operations	(0.01)	0.05	0.44
Net income	$ 1.28	$ 2.07	$ 3.88
Weighted average common shares – basic	88.3	89.2	89.8
Weighted average common shares – diluted	89.0	89.9	90.7
Cash dividends declared per common share	$ 0.512	$ 0.496	$ 0.4732