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GOODWILL AND INTANGIBLE ASSETS - Schedule of Purchased Intangible Assets (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | $ 1,771.6 | $ 1,820.5
Accumulated Amortization | (771.0) | (775.9)
Net | 1,000.6 | 1,044.6
Purchased data files |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 857.6 | 904.0
Accumulated Amortization | (353.8) | (351.8)
Net | 503.8 | 552.2
Acquired software and technology |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 92.8 | 110.1
Accumulated Amortization | (74.0) | (84.0)
Net | 18.8 | 26.1
Customer relationships |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 650.3 | 673.0
Accumulated Amortization | (306.4) | (305.1)
Net | 343.9 | 367.9
Proprietary database |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 149.2 | 108.3
Accumulated Amortization | (24.8) | (20.9)
Net | 124.4 | 87.4
Non-compete agreements |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 7.0 | 7.8
Accumulated Amortization | (3.1) | (3.5)
Net | 3.9 | 4.3
Trade names and other intangible assets |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 14.7 | 17.3
Accumulated Amortization | (8.9) | (10.6)
Net | $ 5.8 | $ 6.7

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