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GOODWILL AND INTANGIBLE ASSETS - SCHEDULE OF GOODWILL (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Goodwill [Line Items] |  |  |
Goodwill | $ 6,369.7 | $ 6,142.5 | $ 6,123.7
Adjustments to goodwill | (72.7) | 55.5 |
Goodwill, Acquired During Period | 299.9 | 296.9 | 598.5
Goodwill, Impairment Loss | 0.0 | (333.6) |
Net Carrying Amount | 3,488.9 | 3,342.0 |
Goodwill Impairment, Cumulative | 648.5 |  |
Goodwill Impairment, Remaining Goodwill for ED Reporting Unit | 0.0 |  |
Gross Carrying Amount | 5,433.3 | 5,058.4 |
Accumulated Amortization | (1,944.4) | (1,716.4) |
Goodwill [Roll Forward] |  |  |
Balance as of January 1 | 6,142.5 | 6,123.7 |
Adjustments to goodwill | (72.7) | 55.5 |
Goodwill, net | 6,369.7 | 6,142.5 | 6,123.7
Goodwill and other asset impairments | 5.3 | 349.0 | 261.7
Customer Relationships [Member] |  |  |
Goodwill [Line Items] |  |  |
Net Carrying Amount | 2,574.0 |  |
Gross Carrying Amount | 4,114.7 |  |
Accumulated Amortization | (1,540.7) |  |
Patents, Licenses And Technology [Member] |  |  |
Goodwill [Line Items] |  |  |
Net Carrying Amount | 348.6 |  |
Gross Carrying Amount | 646.9 |  |
Accumulated Amortization | (298.3) |  |
Non-compete agreements [Member] |  |  |
Goodwill [Line Items] |  |  |
Net Carrying Amount | 96.3 |  |
Gross Carrying Amount | 180.2 |  |
Accumulated Amortization | (83.9) |  |
In Process R&A and Media |  |  |
Goodwill [Line Items] |  |  |
Net Carrying Amount | 18.4 | 18.6 |
Gross Carrying Amount | 39.9 | 34.1 |
Accumulated Amortization | (21.5) | (15.5) |
Licensing Agreements [Member] |  |  |
Goodwill [Line Items] |  |  |
Net Carrying Amount | 451.6 |  |
Gross Carrying Amount | 451.6 |  |
Accumulated Amortization | 0.0 |  |
Patents, Licenses And Technology [Member] |  |  |
Goodwill [Line Items] |  |  |
Net Carrying Amount |  | 253.3 |
Gross Carrying Amount |  | 526.6 |
Accumulated Amortization |  | (273.3) |
Customer Relationships [Member] |  |  |
Goodwill [Line Items] |  |  |
Net Carrying Amount |  | 2,501.4 |
Gross Carrying Amount |  | 3,868.6 |
Accumulated Amortization |  | (1,367.2) |
Non-compete agreements [Member] |  |  |
Goodwill [Line Items] |  |  |
Net Carrying Amount |  | 69.9 |
Gross Carrying Amount |  | 130.3 |
Accumulated Amortization |  | (60.4) |
Licensing Agreements [Member] |  |  |
Goodwill [Line Items] |  |  |
Net Carrying Amount |  | 498.8 |
Gross Carrying Amount |  | 498.8 |
Accumulated Amortization |  | 0.0 |
LabCorp Diagnostics [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 5,102.5 | 4,813.9 | 4,533.5
Adjustments to goodwill | (11.3) | (16.5) |
Goodwill, Acquired During Period | 299.9 | 296.9 |
Goodwill, Impairment Loss | 0.0 | 0.0 |
Goodwill [Roll Forward] |  |  |
Balance as of January 1 | 4,813.9 | 4,533.5 |
Adjustments to goodwill | (11.3) | (16.5) |
Goodwill, net | 5,102.5 | 4,813.9 | 4,533.5
Biopharma Laboratory Services |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 1,267.2 | 1,328.6 | 1,590.2
Adjustments to goodwill | (61.4) | 72.0 |
Goodwill, Acquired During Period | 0.0 | 0.0 |
Goodwill, Impairment Loss | 0.0 | (333.6) |
Goodwill and other asset impairments |  | 333.6 |
Goodwill [Roll Forward] |  |  |
Balance as of January 1 | 1,328.6 | 1,590.2 |
Adjustments to goodwill | (61.4) | 72.0 |
Goodwill, net | $ 1,267.2 | $ 1,328.6 | $ 1,590.2

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