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GOODWILL AND INTANGIBLE ASSETS - Schedule of Purchased Intangible Assets (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | $ 1,799.5 | $ 1,876.9
Accumulated Amortization | (715.9) | (777.7)
Net | 1,083.6 | 1,099.2
Purchased data files |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 912.3 | 911.4
Accumulated Amortization | (311.1) | (298.7)
Net | 601.2 | 612.7
Acquired software and technology |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 114.1 | 130.3
Accumulated Amortization | (72.5) | (84.1)
Net | 41.6 | 46.2
Customer relationships |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 698.8 | 693.1
Accumulated Amortization | (303.7) | (295.2)
Net | 395.1 | 397.9
Reacquired rights |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 0.0 | 73.3
Accumulated Amortization | 0.0 | (73.3)
Net | 0.0 | 0.0
Proprietary database |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 49.8 | 46.3
Accumulated Amortization | (13.9) | (12.5)
Net | 35.9 | 33.8
Non-compete agreements |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 5.5 | 3.8
Accumulated Amortization | (2.6) | (2.2)
Net | 2.9 | 1.6
Trade names and other intangible assets |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 19.0 | 18.7
Accumulated Amortization | (12.1) | (11.7)
Net | $ 6.9 | $ 7.0

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