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GOODWILL AND OTHER INTANGIBLE ASSETS (Purchased Intangible Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | $ 2,000.1 | $ 2,032.6
Accumulated Amortization | (753.1) | (708.8)
Net | 1,247.0 | 1,323.8
Purchased data files |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 955.7 | 1,012.7
Accumulated Amortization | (262.2) | (276.0)
Net | 693.5 | 736.7
Acquired software and technology |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 142.3 | 131.5
Accumulated Amortization | (66.6) | (36.1)
Net | 75.7 | 95.4
Customer relationships |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 772.4 | 712.7
Accumulated Amortization | (326.7) | (273.0)
Net | 445.7 | 439.7
Reacquired rights |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 73.3 | 73.3
Accumulated Amortization | (65.6) | (52.5)
Net | 7.7 | 20.8
Proprietary database |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 22.1 | 21.5
Accumulated Amortization | (8.7) | (6.7)
Net | 13.4 | 14.8
Non-compete agreements |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 14.1 | 26.8
Accumulated Amortization | (12.7) | (22.2)
Net | 1.4 | 4.6
Trade names and other intangible assets |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 20.2 | 54.1
Accumulated Amortization | (10.6) | (42.3)
Net | $ 9.6 | $ 11.8

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