CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Oct. 02, 2021	Sep. 26, 2020	Oct. 02, 2021	Sep. 26, 2020
Income Statement [Abstract]
Revenue	$ 689.6	$ 591.2	$ 2,079.6	$ 1,769.2
Costs of revenue	467.6	400.6	1,404.0	1,205.6
Gross profit	222.0	190.6	675.6	563.6
General and administrative expenses	55.9	47.1	168.2	148.8
Sales and marketing expenses	37.4	33.4	112.4	110.7
Research and development expenses	22.5	19.7	70.0	61.3
Asbestos-related costs (benefit), net	0.0	141.4	(74.4)	116.7
Restructuring costs	4.5	11.5	8.2	42.5
Asset impairment charges	0.0	0.0	0.0	16.3
Operating income (loss)	101.7	(62.5)	391.2	67.3
Interest and non-operating expenses (income), net	0.5	1.2	(4.3)	4.0
Income (loss) from continuing operations before income tax expense (benefit)	101.2	(63.7)	395.5	63.3
Income tax expense (benefit)	14.1	(16.2)	182.7	(19.6)
Income (loss) from continuing operations	87.1	(47.5)	212.8	82.9
Income from discontinued operations, net of tax	0.9	1.2	0.9	3.9
Net income (loss)	88.0	(46.3)	213.7	86.8
Less: Income attributable to noncontrolling interests	0.5	0.5	1.0	0.8
Net income attributable to ITT Inc.	87.5	(46.8)	212.7	86.0
Amounts attributable to ITT Inc.:
Income (loss) from continuing operations, net of tax	86.6	(48.0)	211.8	82.1
Income from discontinued operations, net of tax	0.9	1.2	0.9	3.9
Net income attributable to ITT Inc.	$ 87.5	$ (46.8)	$ 212.7	$ 86.0
Basic:
Continuing operations	$ 1.01	$ (0.55)	$ 2.46	$ 0.95
Discontinued operations	0.01	0.01	0.01	0.04
Net income (loss)	1.02	(0.54)	2.47	0.99
Diluted:
Continuing operations	1.00	(0.55)	2.45	0.94
Discontinued operations	0.01	0.01	0.01	0.04
Net income (loss)	$ 1.01	$ (0.54)	$ 2.46	$ 0.98
Weighted average common shares – basic	85.9	86.4	86.1	86.8
Weighted average common shares – diluted	86.3	86.4	86.6	87.4