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RECEIVABLES, NET Allowance for Credit Losses Rollforward (Details) - USD ($) $ in Millions | 3 Months Ended
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Apr. 02, 2022 | Apr. 03, 2021
Credit Loss [Abstract] |  |
Total allowance for credit losses - January 1 | $ 12.5 | $ 15.6
Charges (recoveries) to income(a) | 3.8 | (0.2)
Write-offs | (0.3) | (0.1)
Foreign currency and other | (0.1) | (0.1)
Total allowance for credit losses - ending balance | $ 15.9 | $ 15.2

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- Definition Allowance for Credit Loss, Foreign Currency and Other + References No definition available. + Details
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Balance Type: | credit
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- Definition Total Allowance for Credit Losses + References No definition available. + Details
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Namespace Prefix: | itt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of direct write-downs of accounts receivable charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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- Definition Amount of expense (reversal of expense) for expected credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(5)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
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