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GOODWILL AND INTANGIBLE ASSETS (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible Assets, Gross (Excluding Goodwill) | $ 5,149.2 |  | $ 5,058.4
Goodwill | 6,218.9 |  | 6,142.5
Amortization of intangibles and other assets | 60.1 | $ 53.4 |
Adjustments to goodwill | (65.3) |  |
Estimated amortization expense, 2013 | 237.3 |  |
Estimated amortization expense, 2014 | 228.4 |  |
Estimated amortization expense, 2015 | 217.1 |  |
Estimated amortization expense, 2016 | 209.0 |  |
Estimated amortization expense, Thereafter | 1,737.4 |  |
Current Expected Credit Losses Opening Balance Sheet Impact on Retained Earnings | 2.4 |  |
Amortization of intangible assets | 60.1 | $ 53.4 |
LabCorp Diagnostics [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill | 4,946.2 |  | 4,813.9
Adjustments to goodwill | (9.4) |  |
Covance Drug Development [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill | 1,272.7 |  | $ 1,328.6
Adjustments to goodwill | $ (55.9) |  |

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