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GOODWILL AND INTANGIBLE ASSETS (Changes in Carrying Amount of Goodwill) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Dec. 31, 2024
Goodwill [Line Items] |  |
Balance as of January 1 | $ 6,369.7 |
Goodwill, Acquired During Period | 36.4 |
Foreign currency impact and other adjustments to Goodwill | 15.0 |
Balance at end of period | 6,421.1 |
Goodwill Impairment, Cumulative | 648.5 | $ 648.5
LabCorp Diagnostics [Member] |  |
Goodwill [Line Items] |  |
Balance as of January 1 | 5,102.5 |
Goodwill, Acquired During Period | 36.4 |
Foreign currency impact and other adjustments to Goodwill | (7.3) |
Balance at end of period | 5,131.6 |
Covance Drug Development [Member] |  |
Goodwill [Line Items] |  |
Balance as of January 1 | 1,267.2 |
Goodwill, Acquired During Period | 0.0 |
Foreign currency impact and other adjustments to Goodwill | 22.3 |
Balance at end of period | $ 1,289.5 |

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