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GOODWILL AND INTANGIBLE ASSETS - Schedule of Purchased Intangible Assets (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | $ 1,821.8 | $ 1,820.5
Accumulated Amortization | (809.1) | (775.9)
Net | 1,012.7 | 1,044.6
Purchased data files |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 883.8 | 904.0
Accumulated Amortization | (364.8) | (351.8)
Net | 519.0 | 552.2
Acquired software and technology |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 104.8 | 110.1
Accumulated Amortization | (88.0) | (84.0)
Net | 16.8 | 26.1
Customer relationships |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 664.3 | 673.0
Accumulated Amortization | (316.2) | (305.1)
Net | 348.1 | 367.9
Proprietary database |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 147.0 | 108.3
Accumulated Amortization | (27.0) | (20.9)
Net | 120.0 | 87.4
Non-compete agreements |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 7.0 | 7.8
Accumulated Amortization | (3.5) | (3.5)
Net | 3.5 | 4.3
Trade names and other intangible assets |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 14.9 | 17.3
Accumulated Amortization | (9.6) | (10.6)
Net | $ 5.3 | $ 6.7

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