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GOODWILL AND OTHER INTANGIBLE ASSETS - Purchased Intangible Assets (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | $ 1,876.9 | $ 2,000.1
Accumulated Amortization | (777.7) | (753.1)
Net | 1,099.2 | 1,247.0
Purchased data files |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 911.4 | 955.7
Accumulated Amortization | (298.7) | (262.2)
Net | 612.7 | 693.5
Acquired software and technology |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 130.3 | 142.3
Accumulated Amortization | (84.1) | (66.6)
Net | 46.2 | 75.7
Customer relationships |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 693.1 | 772.4
Accumulated Amortization | (295.2) | (326.7)
Net | 397.9 | 445.7
Reacquired rights |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 73.3 | 73.3
Accumulated Amortization | (73.3) | (65.6)
Net | 0.0 | 7.7
Proprietary database |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 46.3 | 22.1
Accumulated Amortization | (12.5) | (8.7)
Net | 33.8 | 13.4
Non-compete agreements |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 3.8 | 14.1
Accumulated Amortization | (2.2) | (12.7)
Net | 1.6 | 1.4
Trade names and other intangible assets |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 18.7 | 20.2
Accumulated Amortization | (11.7) | (10.6)
Net | $ 7.0 | $ 9.6

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