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GOODWILL AND INTANGIBLE ASSETS (Purchased Intangible Assets) (Details) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | $ 2,065.0 | $ 1,439.8
Accumulated Amortization | (660.1) | (611.9)
Net | 1,404.9 | 827.9
Purchased data files |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 1,024.6 | 665.9
Accumulated Amortization | (247.5) | (240.6)
Net | 777.1 | 425.3
Acquired software and technology |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 150.2 | 52.4
Accumulated Amortization | (40.6) | (35.5)
Net | 109.6 | 16.9
Customer relationships |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 723.5 | 565.9
Accumulated Amortization | (260.3) | (239.3)
Net | 463.2 | 326.6
Reacquired rights |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 73.3 | 73.3
Accumulated Amortization | (46.0) | (39.4)
Net | 27.3 | 33.9
Proprietary database |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 7.4 | 7.4
Accumulated Amortization | (6.0) | (5.8)
Net | 1.4 | 1.6
Non-compete agreements |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 28.2 | 25.8
Accumulated Amortization | (20.9) | (18.3)
Net | 7.3 | 7.5
Trade names and other intangible assets |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 57.8 | 49.1
Accumulated Amortization | (38.8) | (33.0)
Net | $ 19.0 | $ 16.1

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