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ACQUISITIONS AND INVESTMENTS (Acquired Intangible Assets Fair Value and Weighted-Average Useful Life) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |
Fair value | $ 51.0 | $ 681.0
Weighted-average useful life | 9 years 6 months | 12 years 10 months 24 days
Customer relationships |  |
Business Acquisition [Line Items] |  |
Fair value | $ 42.7 | $ 171.3
Weighted-average useful life | 10 years 2 months | 14 years 10 months 24 days
Acquired software and technology |  |
Business Acquisition [Line Items] |  |
Fair value | $ 6.5 | $ 106.3
Weighted-average useful life | 6 years 6 months | 4 years 2 months 12 days
Purchased data files |  |
Business Acquisition [Line Items] |  |
Fair value | $ 0.0 | $ 387.5
Weighted-average useful life |  | 14 years 9 months 18 days
Non-compete agreements |  |
Business Acquisition [Line Items] |  |
Fair value | 0.0 | $ 5.4
Weighted-average useful life |  | 2 years 1 month 6 days
Trade names and other intangible assets |  |
Business Acquisition [Line Items] |  |
Fair value | $ 1.8 | $ 10.5
Weighted-average useful life | 2 years 11 months | 1 year

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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