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BASIS OF FINANCIAL STATEMENT PRESENTATION (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Asset Impairment Charges | $ 2.5 | $ 2.2 |  |
Revenues | 3,176.6 | $ 3,037.8 |  |
Contract with Customer, Liability | $ 377.5 |  | $ 421.7 |
Percent of Revenue Contributed | 100.00% | 100.00% |  |
Ownership percentage below which investments are generally accounted for on the cost method (in thousandths) | 20.00% |  |  |
Provision for income taxes | $ 69.1 | $ 63.9 |  |
Net Income (Loss) Attributable to Parent | 228.0 | 212.9 |  |
Stockholders' Equity Attributable to Parent | 7,959.6 | 10,341.5 | 7,875.0 | $ 10,096.6
Deferred Revenue, Revenue Recognized | 51.0 | $ 52.6 |  |
Cash and cash equivalents | $ 99.3 |  | $ 536.8 |
LabCorp Diagnostics [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Revenue Contributed | 78.00% | 78.00% |  |

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