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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, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |
Fair value | $ 92.0 | $ 50.9
Weighted-average useful life | 7 years 3 months 18 days | 9 years 9 months 18 days
Customer relationships |  |
Business Acquisition [Line Items] |  |
Fair value | $ 17.1 | $ 16.5
Weighted-average useful life | 9 years 10 months 24 days | 9 years
Acquired software and technology |  |
Business Acquisition [Line Items] |  |
Fair value |  | $ 2.7
Weighted-average useful life |  | 2 years 8 months 12 days
Purchased data files |  |
Business Acquisition [Line Items] |  |
Fair value | $ 68.6 | $ 30.2
Weighted-average useful life | 6 years 10 months 24 days | 11 years 3 months 18 days
Non-compete agreements |  |
Business Acquisition [Line Items] |  |
Fair value | $ 4.0 | $ 0.8
Weighted-average useful life | 5 years | 2 years 7 months 6 days
Trade names and other intangible assets |  |
Business Acquisition [Line Items] |  |
Fair value | $ 2.3 | $ 0.7
Weighted-average useful life | 4 years 6 months | 1 year 10 months 24 days

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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://fasb.org/us-gaap/role/ref/legacyRef -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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=116868840&loc=d3e2207-128464 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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