CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Revenue	$ 2,477.8	$ 2,846.4	$ 2,745.1
Costs of revenue	1,695.6	1,936.3	1,857.9
Gross profit	782.2	910.1	887.2
General and administrative expenses	200.7	240.3	253.9
Sales and marketing expenses	146.5	165.9	168.2
Research and development expenses	84.9	97.9	98.4
Asbestos-related costs (benefit), net	66.3	(20.2)	4.9
Restructuring costs	43.0	12.8	5.2
Asset impairment charges	16.3	1.0	0.0
(Gain) loss on sale or disposal of long-lived assets	(2.0)	1.0	(40.7)
Operating income	226.5	411.4	397.3
Interest (income) expense, net	(0.7)	(4.1)	0.5
Non-operating postretirement costs	144.2	4.5	7.1
Nonoperating Income (Expense)	(2.2)	(3.4)	(1.3)
Income from continuing operations before income tax	85.2	414.4	391.0
Income tax expense	15.3	89.9	57.7
Income from continuing operations	69.9	324.5	333.3
Income from discontinued operations, including tax (expense) benefit of $(0.2), $0.6, and $(0.3), respectively	4.0	1.7	1.3
Net income	73.9	326.2	334.6
Less: Income attributable to noncontrolling interests	1.4	1.1	0.9
Net income attributable to ITT Inc.	72.5	325.1	333.7
Amounts attributable to ITT Inc.:
Income from continuing operations, net of tax	68.5	323.4	332.4
Net income attributable to ITT Inc.	$ 72.5	$ 325.1	$ 333.7
Basic earnings per share:
Continuing operations	$ 0.79	$ 3.69	$ 3.79
Discontinued operations	0.05	0.02	0.02
Net income	0.84	3.71	3.81
Diluted earnings per share:
Continuing operations	0.78	3.65	3.75
Discontinued operations	0.05	0.02	0.01
Net income	$ 0.83	$ 3.67	$ 3.76
Weighted average common shares – basic	86.7	87.7	87.7
Weighted average common shares – diluted	87.3	88.6	88.7