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ACCUMULATED OTHER COMPREHENSIVE LOSS Accumulated Other Comprehensive Loss | 9 Months Ended
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Sep. 30, 2020
Statement of Other Comprehensive Income [Abstract] |
Accumulated Other Comprehensive Loss [Text Block] | ACCUMULATED OTHER COMPREHENSIVE LOSS
| Postretirement Benefit Plans |  | Cumulative Translation Adjustment |  |  |  | Accumulated Other Comprehensive Loss
December 31, 2019 | $ | (133.3) |  |  | $ | (252.0) |  |  |  |  | $ | (385.3) |
Net change during period | 0.9 |  |  | (51.3) |  |  |  |  | (50.4) |
March 31, 2020 | (132.4) |  |  | (303.3) |  |  |  |  | (435.7) |
Net change during period | 0.9 |  |  | 2.1 |  |  |  |  | 3.0 |
June 30, 2020 | $ | (131.5) |  |  | $ | (301.2) |  |  |  |  | $ | (432.7) |
Net change during period | 1.8 |  |  | 23.5 |  |  |  |  | 25.3 |
September 30, 2020 | $ | (129.7) |  |  | $ | (277.7) |  |  |  |  | $ | (407.4) |
| Postretirement Benefit Plans |  | Cumulative Translation Adjustment |  |  |  | Accumulated Other Comprehensive Loss
December 31, 2018 | $ | (131.6) |  |  | $ | (243.9) |  |  |  |  | $ | (375.5) |
Net change during period | 0.6 |  |  | (2.4) |  |  |  |  | (1.8) |
March 31, 2019 | $ | (131.0) |  |  | $ | (246.3) |  |  |  |  | $ | (377.3) |
Net change during period | 0.5 |  |  | 5.3 |  |  |  |  | 5.8 |
June 30, 2019 | $ | (130.5) |  |  | $ | (241.0) |  |  |  |  | $ | (371.5) |
Net change during period | 2.3 |  |  | (34.4) |  |  |  |  | (32.1) |
September 30, 2019 | $ | (128.2) |  |  | $ | (275.4) |  |  |  |  | $ | (403.6) |

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- Definition Accumulated Other Comprehensive Loss [Text Block] + References No definition available. + Details
Name: | itt_AccumulatedOtherComprehensiveLossTextBlock
Namespace Prefix: | itt_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_StatementOfOtherComprehensiveIncomeAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration