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BUSINESS ACQUISITIONS (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Business Combinations [Abstract] |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | $ 293.1 | $ 136.9
Business Acquisition [Line Items] |  |  |  |
Goodwill, Acquired During Period |  |  | 141.7 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets | $ 23.9 |  | 23.9 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | (334.9) |  | (334.9) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | (11.8) |  | (11.8) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | 323.1 |  | 323.1 |
Business Acquisition, Pro Forma Revenue | 3,100.5 | $ 3,220.9 | 6,412.0 | 6,206.5
Business Acquisition, Pro Forma Net Income (Loss) | 193.4 | $ 205.3 | 432.8 | 409.5
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets | 8.1 |  | 8.1 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory | 1.8 |  | 1.8 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | (159.4) |  | (159.4) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents | 0.0 |  | 0.0 |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | 293.1 | 136.9
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other | 3.7 |  | 3.7 |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | 293.1 |  | 293.1 |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory |  |  | 0.0 |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment |  |  | (3.9) |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments Related to Previous Period |  |  | 0.0 |
Escrow Deposit | 30.0 |  | 30.0 |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles |  |  | 7.4 |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Assets |  |  | (3.9) |
Business Combination, Recognized Identifiable Asset Acquired and Liability Assumed, Lease Obligation | 8.1 |  | 8.1 |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities |  |  | (3.9) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  |  | 0.0 |
Estimated amortization expense, 2012 | 125.0 |  | 125.0 |
Gain (Loss) on Disposition of Business |  |  | (4.9) |
Prepaid Expenses and Other Current Assets [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments Related to Previous Period |  |  |  | 0.6
Other Noncurrent Liabilities [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments Related to Previous Period |  |  |  | (2.3)
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities | 0.0 |  |  |
Operating lease liability |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities | (3.9) |  |  |
Accrued Liabilities [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments Related to Previous Period |  |  |  | (8.3)
Goodwill [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles |  |  |  | (29.4)
Goodwill [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments Related to Previous Period |  |  | (7.4) |
Other Noncurrent Assets [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments Related to Previous Period |  |  | 0.0 |
Other acquirees |  |  |  |
Business Combinations [Abstract] |  |  |  |
Finite-lived Intangible Assets Acquired |  |  | 159.4 | 84.1
Business Acquisition [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  |  | 159.4 | 84.1
Goodwill, Acquired During Period |  |  | 141.7 | 50.8
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment |  |  |  | (1.5)
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments Related to Previous Period |  |  |  | 0.0
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles |  |  |  | 19.5
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Assets |  |  |  | (10.6)
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities |  |  |  | (10.6)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  |  |  | $ 0.2
Providence Medical Foundation |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill, Acquired During Period |  |  | 25.9 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets | 0.0 |  | 0.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | (55.8) |  | (55.8) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities | (0.9) |  | (0.9) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | (0.9) |  | (0.9) |
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets | 0.9 |  | 0.9 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory | 0.0 |  | 0.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 29.0 |  | 29.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other | 0.0 |  | 0.0 |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | 54.9 |  | 54.9 |
Escrow Deposit | 0.0 |  | 0.0 |
Westpac Labs, Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill, Acquired During Period |  |  | 45.1 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets | 0.0 |  | 0.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | (97.7) |  | (97.7) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities | 0.0 |  | 0.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | 0.0 |  | 0.0 |
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets | 0.0 |  | 0.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory | 1.8 |  | 1.8 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 50.8 |  | 50.8 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other | 0.0 |  | 0.0 |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | 97.7 |  | 97.7 |
Escrow Deposit | 0.0 |  | 0.0 |
Cash Acquired in Excess of Payments to Acquire Business | 0.0 |  |  |
Baystate Medical Center |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill, Acquired During Period |  |  | 70.7 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets | 0.0 |  | 0.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | (157.5) |  | (157.5) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities | (7.2) |  | (7.2) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | (10.9) |  | (10.9) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | 146.6 |  | 146.6 |
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets | 7.2 |  | 7.2 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory | 0.0 |  | 0.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 79.6 |  | 79.6 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other | 3.7 |  | 3.7 |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | 116.6 |  | 116.6 |
Escrow Deposit | 30.0 |  | 30.0 |
Cash Acquired in Excess of Payments to Acquire Business | 0.0 |  |  |
Other Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Escrow Deposit | 0.0 |  | 0.0 |
Invitae Corporation |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill, Acquired During Period |  |  | 0.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets | 23.9 |  | 23.9 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | (23.9) |  | (23.9) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities | 0.0 |  | 0.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | 0.0 |  | 0.0 |
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets | 0.0 |  | 0.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory | 0.0 |  | 0.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 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, Goodwill, and Liabilities Assumed, Net | 23.9 |  | 23.9 |
Escrow Deposit | 0.0 |  | 0.0 |
Cash Acquired in Excess of Payments to Acquire Business | $ 0.0 |  |  |
Business Combination, Price of Acquisition, Expected |  |  | 239.0 |
BioReference Health |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Price of Acquisition, Expected |  |  | $ 237.5 |
Customer Lists | Maximum [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 15 years | 15 years
Customer Lists | Minimum [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 7 years |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + 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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- Definition Amount of intangible assets, excluding goodwill, 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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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479303/805-10-55-37 Reference 2: 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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- Definition Amount of liabilities assumed 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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- Definition Amount of other assets expected to be realized or consumed after 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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- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479303/805-10-55-37 Reference 2: 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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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 954 -SubTopic 440 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478522/954-440-50-1 + Details
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