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ACCUMULATED OTHER COMPREHENSIVE LOSS Accumulated Other Comprehensive Loss (Notes) | 3 Months Ended
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Mar. 31, 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 | )
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 | )

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- Definition Accumulated Other Comprehensive Loss [Text Block] + References No definition available. + Details
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Namespace Prefix: | itt_
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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