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GOODWILL AND OTHER INTANGIBLE ASSETS - Purchased Intangible Assets (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | $ 3,219.9 | $ 2,937.1
Accumulated Amortization | (1,361.1) | (1,118.6)
Net | 1,858.8 | 1,818.5
Purchased data files |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 1,158.5 | 1,090.0
Accumulated Amortization | (604.2) | (527.8)
Net | 554.3 | 562.2
Proprietary database |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 705.8 | 705.9
Accumulated Amortization | (171.5) | (115.0)
Net | 534.3 | 590.9
Customer relationships |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 1,053.5 | 874.6
Accumulated Amortization | (484.2) | (407.4)
Net | 569.3 | 467.2
Acquired software and technology |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 222.5 | 225.4
Accumulated Amortization | (75.4) | (42.6)
Net | 147.1 | 182.8
Trade names, non-compete agreements and other intangible assets |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 79.6 | 41.2
Accumulated Amortization | (25.8) | (25.8)
Net | $ 53.8 | $ 15.4

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