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BUSINESS SEGMENT INFORMATION (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 13,008.9 | $ 12,161.6 | $ 11,863.9
Depreciation | 387.1 | 357.5 | 343.6
Operating Income (Loss) | 1,086.7 | 725.6 | 1,436.5
Amortization of intangibles and other assets | (256.4) | (219.8) | (193.6)
Net restructuring charges | (46.0) | (49.1) | (54.0)
Goodwill and other asset impairments | 5.3 | 349.0 | 261.7
Property, plant and equipment, net | 3,045.4 | 2,911.8 |
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Income (Loss) | 2,065.2 | 1,987.6 | 2,414.6
Intersegment Eliminations |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 58.0 | 27.7 | 36.9
LabCorp Diagnostics [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Labor | 4,438.7 | 4,095.7 | 3,659.6
Supplies | 2,209.6 | 2,066.0 | 1,914.7
Other operating expenses | 1,630.7 | 1,426.0 | 1,376.6
LabCorp Diagnostics [Member] | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 10,144.3 | 9,415.1 | 9,203.5
Depreciation | 259.0 | 236.1 | 227.1
Operating Income (Loss) | 1,606.3 | 1,591.3 | 2,025.5
Biopharma Laboratory Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Labor | 1,165.3 | 1,094.0 | 1,069.6
Supplies | 441.9 | 452.2 | 460.6
Shipping costs | 365.8 | 333.0 | 311.3
Other operating expenses | 368.1 | 386.2 | 353.9
Biopharma Laboratory Services | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 2,922.6 | 2,774.2 | 2,697.3
Depreciation | 122.6 | 112.5 | 112.8
Operating Income (Loss) | 458.9 | 396.3 | 389.1
Corporate Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation | 5.5 | 8.9 | 3.7
Operating Income (Loss) | (670.8) | (644.1) | $ (468.8)
Other countries [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Property, plant and equipment, net | 113.8 | 98.9 |
North America |  |  |
Segment Reporting Information [Line Items] |  |  |
Property, plant and equipment, net | 2,576.1 | 2,418.2 |
Europe [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Property, plant and equipment, net | $ 355.5 | $ 394.7 |

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