Document and Entity Information - shares shares in Millions	6 Months Ended
	Jul. 03, 2021	Aug. 04, 2021
Cover [Abstract]
Entity Registrant Name	ITT INC.
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Jul. 03, 2021
Document Fiscal Year Focus	2021
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity File Number	001-05672
Entity Central Index Key	0000216228
Entity Incorporation, State or Country Code	IN
Entity Tax Identification Number	81-1197930
Entity Address, Address Line One	1133 Westchester Avenue
Entity Address, City or Town	White Plains
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10604
City Area Code	(914)
Local Phone Number	641-2000
Title of 12(b) Security	Common Stock, par value $1 per share
Trading Symbol	ITT
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		86.1