| Document and Entity Information | Jun. 30, 2020 |
| Cover [Abstract] | |
| Entity Address, State or Province | NY |
| Amendment Flag | false |
| Entity Central Index Key | 0000216228 |
| Document Type | 8-K |
| Document Period End Date | Jun. 30, 2020 |
| Entity Registrant Name | ITT INC. |
| Entity Incorporation State Country Code | IN |
| Entity File Number | 001-05672 |
| Entity Tax Identification Number | 81-1197930 |
| Entity Address, Address Line One | 1133 Westchester Avenue |
| Entity Address, City or Town | White Plains |
| Entity Address, Postal Zip Code | 10604 |
| City Area Code | (914) |
| Local Phone Number | 641-2000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, par value $1 per share |
| Trading Symbol | ITT |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
