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BUSINESS ACQUISITIONS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Business Acquisition [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | $ (63.1) | $ (8.4) | $ (94.7) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | 869.0 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue | 0.0 |  | 0.7 |
Business Combination, Recognized Identifiable Asset Acquired and Liability Assumed, Lease Obligation | 67.0 |  | 2.9 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other |  | 4.1 | 14.6 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable |  | 1.2 | 3.7 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other |  | 3.2 | 72.8 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities |  | 2.3 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 932.1 | 663.1 | 1,258.7 |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | 839.0 | 671.5 | 1,164.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment | 123.3 | 13.0 | 53.5 |
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets |  |  | 32.7 |
Goodwill, Acquired During Period, net of measurement period adjustments | 299.9 | 267.5 | 558.1 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets | 8.4 | 1.5 | 1.9 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables |  | (0.6) | (0.5) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other |  |  | (0.3) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets |  | 20.1 | 12.5 |
Payments to Acquire Businesses, Net of Cash Acquired | 839.0 | 671.5 | 1,164.0 |
Finite-lived Intangible Assets Acquired | 477.3 |  |  |
Goodwill, Acquired During Period | 299.9 | 296.9 | 598.5 |
Payments to Acquire Equity Method Investments | $ 55.0 | 29.0 | 17.4 |
SYNLAB |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Subsidiary, Ownership Percentage, Noncontrolling Owner | 15.00% |  |  |
Other acquirees [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | $ (0.6) | (1.7) | (15.4) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue | 0.0 |  | 0.0 |
Business Combination, Recognized Identifiable Asset Acquired and Liability Assumed, Lease Obligation | 0.6 |  | 0.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other |  | 4.1 | 0.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable |  | 1.2 | 0.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other | 0.0 | 1.2 | 15.4 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities |  | 0.0 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 88.5 | 72.1 | 300.6 |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | 87.9 | 73.8 | 285.2 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment | 1.3 | 6.5 | 0.1 |
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets |  |  | 0.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets | 0.0 | 0.3 | 0.3 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables |  | (2.0) | (1.3) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other |  |  | 0.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 46.2 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets |  | 17.9 | 2.3 |
Finite-lived Intangible Assets Acquired | 440.3 | 340.8 | 542.3 |
Goodwill, Acquired During Period | 41.0 | 18.5 | 126.7 |
Ascension Acquisition |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  | (2.9) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue |  |  | 0.0 |
Business Combination, Recognized Identifiable Asset Acquired and Liability Assumed, Lease Obligation |  |  | 2.9 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other |  |  | 0.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable |  |  | 0.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other |  |  | 0.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  | 426.7 |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  | 423.8 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  | 43.5 |
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets |  |  | 0.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets |  |  | 0.4 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables |  |  | 0.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other |  |  | 0.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets |  |  | 0.0 |
Goodwill, Acquired During Period |  |  | 125.0 |
Measurement Period Adjustments |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | 7.2 | 10.6 | 2.6 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue |  |  | (2.6) |
Business Combination, Recognized Identifiable Asset Acquired and Liability Assumed, Lease Obligation | 0.0 |  | 0.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other |  | 0.0 | 0.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable |  | 0.0 | (0.1) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other | (3.9) | (8.3) | 0.1 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities |  | (2.3) |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  | (10.6) | (2.6) |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  | 0.0 | 0.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  | (1.5) | 0.0 |
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets |  |  | 15.2 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets | 8.4 | 0.6 | 0.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables |  | (0.2) | 2.3 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other |  |  | 3.2 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  | 19.5 | 30.4 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets |  | 0.0 | (2.3) |
Goodwill, Acquired During Period |  | (29.4) | (40.4) |
PGDx |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  | (79.0) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue |  |  | 3.3 |
Business Combination, Recognized Identifiable Asset Acquired and Liability Assumed, Lease Obligation |  |  | 0.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other |  |  | 14.6 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable |  |  | 3.8 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other |  |  | 57.3 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  | 534.0 |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  | 455.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  | 9.9 |
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets |  |  | 17.5 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets |  |  | 1.2 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables |  |  | (4.1) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other |  |  | (2.9) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets |  |  | 12.5 |
Goodwill, Acquired During Period |  |  | 346.8 |
2022 acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, Pro Forma Revenue |  |  | 11,984.7 | $ 13,325.7
Business Acquisition, Pro Forma Net Income (Loss) |  |  | 1,006.8 | $ 2,182.4
2023 acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, Pro Forma Revenue |  | 12,350.1 | 12,126.3 |
Business Acquisition, Pro Forma Net Income (Loss) |  | 397.2 | $ 1,030.3 |
Providence Health |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | (3.9) |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other |  | 0.0 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable |  | 0.0 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other |  | 3.9 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities |  | 0.0 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  | 113.9 |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  | 110.0 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  | 4.7 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets |  | 0.0 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables |  | 0.0 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets |  | 0.0 |  |
Goodwill, Acquired During Period |  | 50.7 |  |
Tufts Medicine |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | 0.0 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other |  | 0.0 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable |  | 0.0 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other |  | 0.0 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities |  | 0.0 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  | 157.0 |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  | 157.0 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  | 0.0 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets |  | 0.0 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables |  | 0.0 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets |  | 0.0 |  |
Goodwill, Acquired During Period |  | 73.8 |  |
Legacy Health |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | 0.0 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other |  | 0.0 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable |  | 0.0 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other |  | 0.0 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities |  | 0.0 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  | 107.7 |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  | 107.7 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  | 3.3 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets |  | 0.2 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables |  | 0.0 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets |  | 0.0 |  |
Goodwill, Acquired During Period |  | 49.0 |  |
2024 acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, Pro Forma Revenue | 13,353.6 | 12,716.4 |  |
Business Acquisition, Pro Forma Net Income (Loss) | 761.8 | $ 423.3 |  |
SYNLAB | United States of America, Dollars |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Payments to Acquire Equity Method Investments | 155.9 |  |  |
SYNLAB | Euro Member Countries, Euro |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Payments to Acquire Equity Method Investments | 140.0 |  |  |
BioReference Health |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | 0.0 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue | 0.0 |  |  |
Business Combination, Recognized Identifiable Asset Acquired and Liability Assumed, Lease Obligation | 0.0 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other | 0.0 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 237.6 |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | 237.6 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment | 9.1 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 121.1 |  |  |
Goodwill, Acquired During Period | $ 107.4 |  |  |
Customer Relationships [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 15 years |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 19 years |
Customer Relationships [Member] | Other acquirees [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 15 years |
Technology-Based Intangible Assets |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 15 years |
Trade Names [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 10 years |
Trade Names [Member] | Other acquirees [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 5 years |
Non-compete agreements [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 5 years |  |
Non-compete agreements [Member] | Other acquirees [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 5 years |  |
Trade Names [Member] | Maximum [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 15 years |  |  |
Customer Relationships [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 14 years 4 months 24 days |  |  |
Finite-lived Intangible Assets Acquired | $ 309.0 |  |  |
Customer Relationships [Member] | Maximum [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 36 years |  |  |

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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479907/805-20-50-1 + Details
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