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GOODWILL AND INTANGIBLE ASSETS - Schedule of Purchased Intangible Assets (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | $ 2,104.3 | $ 1,878.6
Accumulated Amortization | (838.8) | (880.8)
Net | 1,265.5 | 997.8
Purchased data files |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 1,145.1 | 913.7
Accumulated Amortization | (417.4) | (399.2)
Net | 727.7 | 514.5
Acquired software and technology |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 44.5 | 115.3
Accumulated Amortization | (32.5) | (106.6)
Net | 12.0 | 8.7
Customer relationships |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 686.2 | 680.1
Accumulated Amortization | (339.3) | (331.4)
Net | 346.9 | 348.7
Proprietary database |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 201.2 | 148.6
Accumulated Amortization | (36.0) | (30.7)
Net | 165.2 | 117.9
Non-compete agreements |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 9.3 | 6.5
Accumulated Amortization | (3.5) | (3.5)
Net | 5.8 | 3.0
Trade names and other intangible assets |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 18.0 | 14.4
Accumulated Amortization | (10.1) | (9.4)
Net | $ 7.9 | $ 5.0

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