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GOODWILL AND INTANGIBLE ASSETS (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible Assets, Gross (Excluding Goodwill) | $ 5,443.5 |  | $ 5,443.5 |  | $ 5,058.4
Goodwill | 6,482.4 |  | 6,482.4 |  | 6,142.5
Amortization of intangibles and other assets | 63.7 | $ 55.7 | 186.0 | $ 160.6 |
Adjustments to goodwill |  |  | (9.6) |  |
Estimated amortization expense, 2013 | 260.4 |  | 260.4 |  |
Estimated amortization expense, 2014 | 251.4 |  | 251.4 |  |
Estimated amortization expense, 2015 | 240.1 |  | 240.1 |  |
Estimated amortization expense, 2016 | 232.2 |  | 232.2 |  |
Estimated amortization expense, Thereafter | 1,915.4 |  | 1,915.4 |  |
Current Expected Credit Losses Opening Balance Sheet Impact on Retained Earnings |  |  | 7.7 |  |
Amortization of intangible assets | 63.7 | $ 55.7 | 186.0 | $ 160.6 |
LabCorp Diagnostics [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill | 5,153.9 |  | 5,153.9 |  | 4,813.9
Adjustments to goodwill |  |  | (9.5) |  |
Covance Drug Development [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill | $ 1,328.5 |  | 1,328.5 |  | $ 1,328.6
Adjustments to goodwill |  |  | $ (0.1) |  |

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