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GOODWILL AND INTANGIBLE ASSETS - Purchased Intangible Assets (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | $ 2,054.1 | $ 2,032.6
Accumulated Amortization | (777.3) | (708.8)
Net | 1,276.8 | 1,323.8
Purchased data files |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 1,029.2 | 1,012.7
Accumulated Amortization | (310.6) | (276.0)
Net | 718.6 | 736.7
Acquired software and technology |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 139.6 | 131.5
Accumulated Amortization | (59.6) | (36.1)
Net | 80.0 | 95.4
Customer relationships |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 756.9 | 712.7
Accumulated Amortization | (313.9) | (273.0)
Net | 443.0 | 439.7
Reacquired rights |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 73.3 | 73.3
Accumulated Amortization | (62.4) | (52.5)
Net | 10.9 | 20.8
Proprietary database |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 22.1 | 21.5
Accumulated Amortization | (8.1) | (6.7)
Net | 14.0 | 14.8
Non-compete agreements |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 14.1 | 26.8
Accumulated Amortization | (12.1) | (22.2)
Net | 2.0 | 4.6
Trade names and other intangible assets |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 18.9 | 54.1
Accumulated Amortization | (10.6) | (42.3)
Net | $ 8.3 | $ 11.8

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