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BUSINESS ACQUISITIONS AND DISPOSITIONS (Tables) | 9 Months Ended
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Sep. 30, 2025
Business Combination [Abstract] |
Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block] | The purchase price allocations for these acquisitions were preliminary at September 30, 2025. The valuation of acquired assets and assumed liabilities included the following:
| BioReference Health | Other Business Acquisitions Closed During the Nine Months Ended September 30, 2025 | Measurement Period Adjustments During the Nine Months Ended September 30, 2025 | Amounts Acquired During the Nine Months Ended September 30, 2025 |  |
Property, plant, and equipment | $ | — |  | $ | 0.2 |  | $ | (0.8) |  | $ | (0.6) |  |  |
Goodwill | 105.8 |  | 74.1 |  | 16.8 |  | 196.7 |  |  |
Intangible assets | 119.2 |  | 83.7 |  | (16.0) |  | 186.9 |  |  |
Total assets acquired | 225.0 |  | 158.0 |  | — |  | 383.0 |  |  |
Accrued expenses and other | — |  | 24.0 |  | — |  | 24.0 |  |  |
Other liabilities | 32.5 |  | 2.5 |  | — |  | 35.0 |  |  |
Total liabilities acquired | 32.5 |  | 26.5 |  | — |  | 59.0 |  |  |
Net assets acquired | 192.5 |  | 131.5 |  | — |  | 324.0 |  |  |
Cash paid for acquisitions | $ | 192.5 |  | $ | 131.5 |  | $ | — |  | $ | 324.0 |  |  |
Business Combination, Pro Forma Information [Table Text Block] | Had the aggregate of the Company’s 2025 and 2024 acquisitions, that were accounted for as business combinations, been completed at January 1, 2024, the Company’s unaudited pro forma results would have been as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024 |
Revenues | $ | 3,589.6 |  |  | $ | 3,368.4 |  |  | $ | 10,531.6 |  |  | $ | 10,065.6 |  |
Net earnings attributable to LHI | $ | 266.1 |  |  | $ | 181.1 |  |  | $ | 728.1 |  |  | $ | 640.9 |  |

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