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BASIS OF FINANCIAL STATEMENT PRESENTATION (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Asset Impairment Charges | $ 0.0 |  |  | $ 10.2 |  |  | $ 2.5 | $ 15.2 |  |
Revenues | 3,282.0 |  |  | $ 3,056.8 |  |  | 9,679.5 | $ 9,128.3 |  |
Contract with Customer, Liability | $ 403.1 |  |  |  |  |  | $ 403.1 |  | $ 421.7 |
Percent of Revenue Contributed | 100.00% |  |  | 100.00% |  |  | 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 | $ 41.0 |  |  | $ 55.1 |  |  | $ 172.2 | $ 168.8 |  |
Net Income (Loss) Attributable to Parent | 169.3 | $ 205.3 | $ 228.0 | 183.3 | $ 188.9 | $ 212.9 | 602.6 | 585.1 |  |
Stockholders' Equity Attributable to Parent | 8,170.2 | $ 8,005.8 | $ 7,959.6 | 7,873.1 | $ 8,785.0 | $ 10,341.5 | 8,170.2 | 7,873.1 | 7,875.0 | $ 10,096.6
Deferred Revenue, Revenue Recognized | 20.2 |  |  | $ 6.3 |  |  | 98.0 | $ 79.1 |  |
Cash and cash equivalents | $ 1,517.3 |  |  |  |  |  | $ 1,517.3 |  | $ 536.8 |
LabCorp Diagnostics [Member] |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Percent of Revenue Contributed | 78.00% |  |  | 77.00% |  |  | 78.00% | 77.00% |  |

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