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REVENUE FROM CONTRACTS WITH CUSTOMERS (Disaggregated Revenue) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Revenues	$ 2,455.0	$ 2,182.4	$ 1,944.1
CoStar
Disaggregation of Revenue [Line Items]
Revenues	925.2	837.0	722.8
Information services
Disaggregation of Revenue [Line Items]
Revenues	170.9	157.4	141.7
Multifamily
Disaggregation of Revenue [Line Items]
Revenues	914.2	745.4	678.7
LoopNet
Disaggregation of Revenue [Line Items]
Revenues	264.8	230.9	207.5
Residential
Disaggregation of Revenue [Line Items]
Revenues	46.1	73.7	74.6
Other Marketplaces
Disaggregation of Revenue [Line Items]
Revenues	133.8	138.0	118.8
North America
Disaggregation of Revenue [Line Items]
Revenues	2,365.7	2,106.0	1,877.6
North America | CoStar
Disaggregation of Revenue [Line Items]
Revenues	886.0	800.2	686.9
North America | Information services
Disaggregation of Revenue [Line Items]
Revenues	132.4	125.0	113.8
North America | Multifamily
Disaggregation of Revenue [Line Items]
Revenues	914.2	745.4	678.7
North America | LoopNet
Disaggregation of Revenue [Line Items]
Revenues	255.4	223.7	204.8
North America | Residential
Disaggregation of Revenue [Line Items]
Revenues	43.9	73.7	74.6
North America | Other Marketplaces
Disaggregation of Revenue [Line Items]
Revenues	133.8	138.0	118.8
International
Disaggregation of Revenue [Line Items]
Revenues	89.3	76.4	66.5
International | CoStar
Disaggregation of Revenue [Line Items]
Revenues	39.2	36.8	35.9
International | Information services
Disaggregation of Revenue [Line Items]
Revenues	38.5	32.4	27.9
International | Multifamily
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0
International | LoopNet
Disaggregation of Revenue [Line Items]
Revenues	9.4	7.2	2.7
International | Residential
Disaggregation of Revenue [Line Items]
Revenues	2.2	0.0	0.0
International | Other Marketplaces
Disaggregation of Revenue [Line Items]
Revenues	$ 0.0	$ 0.0	$ 0.0

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