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REVENUES - ACCOUNTS RECEIVABLES, UNBILLED SERVICES, AND UNEARNED REVENUE (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross unbilled services | $ 160.5 | $ 192.9 |
Less reserve for unbilled services | (7.6) | (7.5) |
Contract with Customer, Asset, after Allowance for Credit Loss, Current | 152.9 | 185.4 |
Unearned revenue | 392.2 | 421.7 |
Deferred Revenue, Revenue Recognized | 113.0 | 78.9 | $ 99.7
Accounts Receivable, Allowance for Credit Loss | (44.7) | (32.7) | (30.8)
Allowance for Credit Loss | (52.3) | (40.2) | (41.3)
Accounts Receivable, Credit Loss Expense (Reversal) | 14.6 | 6.3 |
Accounts Receivable, Allowance for Credit Loss, Writeoff | (2.2) | (4.4) |
Unbilled Services, Allowance for Credit Loss | (7.6) | (7.5) | $ (10.5)
Unbilled Services, Credit Loss Expense (Reversal) | 0.1 | 0.0 |
Unbilled Services, Allowance for Credit Loss, Write Off | 0.0 | 3.0 |
Unbilled Services, Allowance for Credit Loss, Write Off | 0.0 | (3.0) |
Credit Loss Expense (Reversal) | 14.7 | 6.3 |
Accounts Receivable, Allowance for Credit Loss, Writeoff | (2.2) | (7.4) |
Financing Receivable, Allowance for Credit Loss, Foreign Currency Translation | 0.4 |  |
Accounts receivable, net | 1,944.1 | 1,913.3 |
LabCorp Diagnostics [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts Receivable, before Allowance for Credit Loss | 1,259.3 | 1,135.2 |
Biopharma Laboratory Services |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts Receivable, before Allowance for Credit Loss | 729.5 | 810.8 |
Accounts Receivable, Allowance for Credit Loss | $ (44.7) | $ (32.7) |

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