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GOODWILL AND OTHER INTANGIBLE ASSETS - Purchased Intangible Assets (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | $ 2,813.4 | $ 1,878.6
Accumulated Amortization | (915.4) | (880.8)
Net | 1,898.0 | 997.8
Purchased data files |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 1,103.1 | 913.7
Accumulated Amortization | (466.0) | (399.2)
Net | 637.1 | 514.5
Proprietary database |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 710.2 | 148.6
Accumulated Amortization | (59.3) | (30.7)
Net | 650.9 | 117.9
Customer relationships |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 805.2 | 680.1
Accumulated Amortization | (354.9) | (331.4)
Net | 450.3 | 348.7
Acquired software and technology |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 160.0 | 115.3
Accumulated Amortization | (18.9) | (106.6)
Net | 141.1 | 8.7
Trade names and other intangible assets |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 23.9 | 14.4
Accumulated Amortization | (12.6) | (9.4)
Net | 11.3 | 5.0
Non-compete agreements |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross | 11.0 | 6.5
Accumulated Amortization | (3.7) | (3.5)
Net | $ 7.3 | $ 3.0

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