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GOODWILL AND INTANGIBLE ASSETS - Schedule of Purchased Intangible Assets (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | $ 2,144.0 | $ 1,878.6
Accumulated Amortization | (872.4) | (880.8)
Net | 1,271.6 | 997.8
Purchased data files |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 1,107.4 | 913.7
Accumulated Amortization | (449.4) | (399.2)
Net | 658.0 | 514.5
Customer relationships |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 788.5 | 680.1
Accumulated Amortization | (348.9) | (331.4)
Net | 439.6 | 348.7
Proprietary database |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 190.1 | 148.6
Accumulated Amortization | (44.8) | (30.7)
Net | 145.3 | 117.9
Acquired software and technology |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 26.5 | 115.3
Accumulated Amortization | (13.8) | (106.6)
Net | 12.7 | 8.7
Trade names and other intangible assets |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 20.4 | 14.4
Accumulated Amortization | (12.3) | (9.4)
Net | 8.1 | 5.0
Non-compete agreements |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 11.1 | 6.5
Accumulated Amortization | (3.2) | (3.5)
Net | $ 7.9 | $ 3.0

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