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ALLOWANCE FOR CREDIT LOSSES (Tables) | 12 Months Ended
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Dec. 31, 2023
Credit Loss [Abstract] |
Schedule of Financing Receivable, Allowance for Credit Loss | The following tables detail the activity related to the allowance for credit losses for trade receivables by portfolio segment (in millions):
| Year Ended December 31, 2023
| CoStar |  | Information Services |  | Multifamily |  | LoopNet |  | Other Marketplaces |  |  |  | Total
Beginning balance at December 31, 2022 | $ | 4.5 |  |  | $ | 1.1 |  |  | $ | 4.3 |  |  | $ | 1.4 |  |  | $ | 0.9 |  |  |  |  | $ | 12.2 |
Current-period provision (release) for expected credit losses | 22.1 |  |  | 1.4 |  |  | 4.9 |  |  | 6.0 |  |  | 0.6 |  |  |  |  | 35.0 |
Write-offs charged against the allowance, net of recoveries and other | (16.9) |  |  | — |  |  | (1.9) |  |  | (4.7) |  |  | (0.5) |  |  |  |  | (24.0) |
Ending balance at December 31, 2023 | $ | 9.7 |  |  | $ | 2.5 |  |  | $ | 7.3 |  |  | $ | 2.7 |  |  | $ | 1.0 |  |  |  |  | $ | 23.2 |
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| Year Ended December 31, 2022
| CoStar |  | Information Services |  | Multifamily |  | LoopNet |  | Other Marketplaces |  |  |  | Total
Beginning balance at December 31, 2021 | $ | 5.4 |  |  | $ | 1.8 |  |  | $ | 3.4 |  |  | $ | 2.0 |  |  | $ | 0.8 |  |  |  |  | $ | 13.4 |
Current-period provision (release) for expected credit losses | 9.2 |  |  | (0.6) |  |  | 5.8 |  |  | 3.8 |  |  | 0.1 |  |  |  |  | 18.3 |
Write-offs charged against the allowance, net of recoveries and other | (10.1) |  |  | (0.1) |  |  | (4.9) |  |  | (4.4) |  |  | — |  |  |  |  | (19.5) |
Ending balance at December 31, 2022 | $ | 4.5 |  |  | $ | 1.1 |  |  | $ | 4.3 |  |  | $ | 1.4 |  |  | $ | 0.9 |  |  |  |  | $ | 12.2 |
| Year Ended December 31, 2021
| CoStar |  | Information Services |  | Multifamily |  | LoopNet |  | Other Marketplaces |  |  |  | Total
Beginning balance at December 31, 2020 | $ | 5.6 |  |  | $ | 2.7 |  |  | $ | 4.4 |  |  | $ | 1.7 |  |  | $ | 0.8 |  |  |  |  | $ | 15.2 |
Current-period provision for expected credit losses | 5.6 |  |  | (0.4) |  |  | 3.1 |  |  | 2.6 |  |  | — |  |  |  |  | 10.9 |
Write-offs charged against the allowance, net of recoveries and other | (5.8) |  |  | (0.5) |  |  | (4.1) |  |  | (2.3) |  |  | — |  |  |  |  | (12.7) |
Ending balance at December 31, 2021 | $ | 5.4 |  |  | $ | 1.8 |  |  | $ | 3.4 |  |  | $ | 2.0 |  |  | $ | 0.8 |  |  |  |  | $ | 13.4 |

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- Definition Tabular disclosure of allowance for credit loss on financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B + Details
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- References No definition available. + Details
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