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BUSINESS ACQUISITIONS & DISPOSITIONS (Details) € in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($) Rate	Dec. 31, 2025 EUR (€)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Business Combination [Line Items]
Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent	$ 0.2
Business Combination, Recognized Asset Acquired, Receivable, Current	0.6			$ 0.6
Business Combination, Recognized Asset Acquired, Inventory, Current	0.9		$ 15.9	1.3
Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment	7.1		123.3	13.0
Goodwill, Acquired During Period, net of measurement period adjustments	298.2		299.9	267.5
Goodwill, Acquired During Period	287.8		390.5	296.9
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill	299.8		484.6	360.3
Business Combination, Recognized Asset Acquired, Asset	606.8		932.1	663.1
Business Combination, Recognized Liability Assumed, Other Liability, Current	37.2		3.9	3.2
Business Combination, Recognized Liability Assumed, Lease Obligation	3.0		67.0
Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent	9.4			4.1
Business Combination, Recognized Liability Assumed, Liability	49.6		63.1	8.4
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill	557.2		869.0	671.5
Other Payments to Acquire Businesses	25.0
Payments to Acquire Businesses, Gross	582.2		839.0
Finite-lived Intangible Assets Acquired	315.9		440.3	340.8
Payments to Acquire Businesses, Net of Cash Acquired	582.0		839.0	671.5
Business Combination, Recognized Asset Acquired, Prepaid Expense and Other Asset, Current			8.4	1.5
Business Combination, Recognized Liability Assumed, Deferred Revenue, Current			0.0
Escrow Deposit			30.0
Business Combination, Recognized Liability Assumed, Accounts Payable, Current				1.2
Business Combination, Recognized Liability Assumed, Deferred Tax Liability				2.3
Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent				20.1
Proceeds from Equity Method Investment, Distribution, Return of Capital	$ 6.0
Proceeds from Sales of Business, Affiliate and Productive Assets			13.5
Gain (Loss) on Disposition of Business			6.4
SYNLAB
Business Combination [Line Items]
Subsidiary, Ownership Percentage, Noncontrolling Owner | Rate	15.00%
Bioreference Health (2025)
Business Combination [Line Items]
Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent	$ 0.0
Business Combination, Recognized Asset Acquired, Receivable, Current	0.0
Business Combination, Recognized Asset Acquired, Inventory, Current	0.0
Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment	0.0
Goodwill, Acquired During Period	105.8
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill	119.2
Business Combination, Recognized Asset Acquired, Asset	225.0
Business Combination, Recognized Liability Assumed, Other Liability, Current	32.5
Business Combination, Recognized Liability Assumed, Lease Obligation	0.0
Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent	0.0
Business Combination, Recognized Liability Assumed, Liability	32.5
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill	192.5
Payments to Acquire Businesses, Gross	192.5
CommunityHealthSystemsInc.
Business Combination [Line Items]
Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent	0.0
Business Combination, Recognized Asset Acquired, Receivable, Current	0.0
Business Combination, Recognized Asset Acquired, Inventory, Current	0.0
Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment	0.0
Goodwill, Acquired During Period	91.4
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill	103.1
Business Combination, Recognized Asset Acquired, Asset	194.5
Business Combination, Recognized Liability Assumed, Other Liability, Current	0.0
Business Combination, Recognized Liability Assumed, Lease Obligation	0.0
Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent	0.0
Business Combination, Recognized Liability Assumed, Liability	0.0
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill	194.5
Payments to Acquire Businesses, Gross	194.5
Other acquirees [Member]
Business Combination [Line Items]
Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent	0.2
Business Combination, Recognized Asset Acquired, Receivable, Current	0.6			2.0
Business Combination, Recognized Asset Acquired, Inventory, Current	0.9		0.0	0.0
Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment	7.9		1.3	6.5
Goodwill, Acquired During Period	90.6		41.0	18.5
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill	100.8		46.2	26.9
Business Combination, Recognized Asset Acquired, Asset	201.0		88.5	72.1
Business Combination, Recognized Liability Assumed, Other Liability, Current	25.3		0.0	1.2
Business Combination, Recognized Liability Assumed, Lease Obligation	3.0		0.6
Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent	2.5			4.1
Business Combination, Recognized Liability Assumed, Liability	30.8		0.6	1.7
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill	170.2		87.9	73.8
Payments to Acquire Businesses, Gross	170.2		87.9
Business Combination, Recognized Asset Acquired, Prepaid Expense and Other Asset, Current			0.0	0.3
Business Combination, Recognized Liability Assumed, Deferred Revenue, Current			0.0
Escrow Deposit			0.0
Business Combination, Recognized Liability Assumed, Accounts Payable, Current				1.2
Business Combination, Recognized Liability Assumed, Deferred Tax Liability				0.0
Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent				17.9
Measurement Period Adjustments
Business Combination [Line Items]
Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent	0.0
Business Combination, Recognized Asset Acquired, Receivable, Current	0.0			0.2
Business Combination, Recognized Asset Acquired, Inventory, Current	0.0		2.0	0.0
Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment	(0.8)		28.1	(1.5)
Goodwill, Acquired During Period	10.4		(90.6)	(29.4)
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill	(23.3)		44.3	19.5
Business Combination, Recognized Asset Acquired, Asset	(13.7)		(7.8)	(10.6)
Business Combination, Recognized Liability Assumed, Other Liability, Current	(20.6)		3.9	(8.3)
Business Combination, Recognized Liability Assumed, Lease Obligation	0.0		0.0
Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent	6.9			0.0
Business Combination, Recognized Liability Assumed, Liability	(13.7)		(7.2)	(10.6)
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill	0.0		(0.6)	0.0
Payments to Acquire Businesses, Gross	0.0		(0.6)
Business Combination, Recognized Asset Acquired, Prepaid Expense and Other Asset, Current			8.4	0.6
Business Combination, Recognized Liability Assumed, Deferred Revenue, Current			(3.3)
Escrow Deposit			0.0
Business Combination, Recognized Liability Assumed, Accounts Payable, Current				0.0
Business Combination, Recognized Liability Assumed, Deferred Tax Liability				(2.3)
Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent				0.0
SYNLAB | United States of America, Dollars
Business Combination [Line Items]
Payments to Acquire Equity Method Investments	151.6
SYNLAB | Euro Member Countries, Euro
Business Combination [Line Items]
Payments to Acquire Equity Method Investments | €		€ 140.4
Empire City Laboratories, Inc
Business Combination [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	250.0
Payment Due at Closing	165.0
Business Combination, Contingent Consideration, Liability	85.0
Parkview Health Systems, Inc.
Business Combination [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	165.0
2025 acquisitions [Member]
Business Combination [Line Items]
Business Combination, Pro Forma Information, Pro Forma Revenue	14,100.6		13,213.1
Business Combination, Pro Forma Information, Pro Forma Income (Loss), after Tax	$ 903.5		782.5
Baystate Medical Center
Business Combination [Line Items]
Business Combination, Recognized Asset Acquired, Inventory, Current			0.0
Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment			7.2
Goodwill, Acquired During Period			70.7
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill			79.8
Business Combination, Recognized Asset Acquired, Asset			157.7
Business Combination, Recognized Liability Assumed, Other Liability, Current			0.0
Business Combination, Recognized Liability Assumed, Lease Obligation			7.2
Business Combination, Recognized Liability Assumed, Liability			7.2
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill			150.5
Payments to Acquire Businesses, Gross			120.5
Business Combination, Recognized Asset Acquired, Prepaid Expense and Other Asset, Current			0.0
Business Combination, Recognized Liability Assumed, Deferred Revenue, Current			0.0
Escrow Deposit			30.0
2024 acquisitions
Business Combination [Line Items]
Business Combination, Pro Forma Information, Pro Forma Revenue			13,353.6	12,716.4
Business Combination, Pro Forma Information, Pro Forma Income (Loss), after Tax			761.8	423.3
Providence Medical Foundation
Business Combination [Line Items]
Business Combination, Recognized Asset Acquired, Inventory, Current			0.0
Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment			0.9
Goodwill, Acquired During Period			25.9
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill			29.2
Business Combination, Recognized Asset Acquired, Asset			56.0
Business Combination, Recognized Liability Assumed, Other Liability, Current			0.0
Business Combination, Recognized Liability Assumed, Lease Obligation			0.9
Business Combination, Recognized Liability Assumed, Liability			0.9
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill			55.1
Payments to Acquire Businesses, Gross			55.1
Business Combination, Recognized Asset Acquired, Prepaid Expense and Other Asset, Current			0.0
Business Combination, Recognized Liability Assumed, Deferred Revenue, Current			0.0
Escrow Deposit			0.0
Westpac Labs, Inc.
Business Combination [Line Items]
Business Combination, Recognized Asset Acquired, Inventory, Current			1.8
Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment			0.0
Goodwill, Acquired During Period			45.1
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill			50.8
Business Combination, Recognized Asset Acquired, Asset			97.7
Business Combination, Recognized Liability Assumed, Other Liability, Current			0.0
Business Combination, Recognized Liability Assumed, Lease Obligation			0.0
Business Combination, Recognized Liability Assumed, Liability			0.0
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill			97.7
Payments to Acquire Businesses, Gross			97.7
Business Combination, Recognized Asset Acquired, Prepaid Expense and Other Asset, Current			0.0
Business Combination, Recognized Liability Assumed, Deferred Revenue, Current			0.0
Escrow Deposit			0.0
Invitae Corporation
Business Combination [Line Items]
Business Combination, Recognized Asset Acquired, Inventory, Current			12.1
Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment			76.7
Goodwill, Acquired During Period			100.4
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill			113.2
Business Combination, Recognized Asset Acquired, Asset			302.4
Business Combination, Recognized Liability Assumed, Other Liability, Current			0.0
Business Combination, Recognized Liability Assumed, Lease Obligation			58.3
Business Combination, Recognized Liability Assumed, Liability			61.6
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill			240.8
Payments to Acquire Businesses, Gross			240.8
Business Combination, Recognized Asset Acquired, Prepaid Expense and Other Asset, Current			0.0
Business Combination, Recognized Liability Assumed, Deferred Revenue, Current			3.3
Escrow Deposit			0.0
BioReference Health (2024)
Business Combination [Line Items]
Business Combination, Recognized Asset Acquired, Inventory, Current			0.0
Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment			9.1
Goodwill, Acquired During Period			107.4
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill			121.1
Business Combination, Recognized Asset Acquired, Asset			237.6
Business Combination, Recognized Liability Assumed, Other Liability, Current			0.0
Business Combination, Recognized Liability Assumed, Lease Obligation			0.0
Business Combination, Recognized Liability Assumed, Liability			0.0
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill			237.6
Payments to Acquire Businesses, Gross			237.6
Business Combination, Recognized Asset Acquired, Prepaid Expense and Other Asset, Current			0.0
Business Combination, Recognized Liability Assumed, Deferred Revenue, Current			0.0
Escrow Deposit			$ 0.0
2023 acquisitions
Business Combination [Line Items]
Business Combination, Pro Forma Information, Pro Forma Revenue				12,350.1	$ 12,126.3
Business Combination, Pro Forma Information, Pro Forma Income (Loss), after Tax				397.2	$ 1,030.3
Jefferson Health
Business Combination [Line Items]
Business Combination, Recognized Asset Acquired, Receivable, Current				0.0
Business Combination, Recognized Asset Acquired, Inventory, Current				0.0
Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment				0.0
Goodwill, Acquired During Period				50.8
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill				57.2
Business Combination, Recognized Asset Acquired, Asset				110.2
Business Combination, Recognized Liability Assumed, Other Liability, Current				0.0
Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent				0.0
Business Combination, Recognized Liability Assumed, Liability				0.0
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill				110.2
Business Combination, Recognized Asset Acquired, Prepaid Expense and Other Asset, Current				0.0
Business Combination, Recognized Liability Assumed, Accounts Payable, Current				0.0
Business Combination, Recognized Liability Assumed, Deferred Tax Liability				0.0
Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent				2.2
Enzo BioChem
Business Combination [Line Items]
Business Combination, Recognized Asset Acquired, Receivable, Current				2.8
Business Combination, Recognized Asset Acquired, Inventory, Current				0.0
Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment				0.0
Goodwill, Acquired During Period				54.1
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill				61.1
Business Combination, Recognized Asset Acquired, Asset				112.8
Business Combination, Recognized Liability Assumed, Other Liability, Current				0.0
Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent				0.0
Business Combination, Recognized Liability Assumed, Liability				0.0
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill				112.8
Business Combination, Recognized Asset Acquired, Prepaid Expense and Other Asset, Current				0.4
Business Combination, Recognized Liability Assumed, Accounts Payable, Current				0.0
Business Combination, Recognized Liability Assumed, Deferred Tax Liability				0.0
Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent				0.0
Providence Health
Business Combination [Line Items]
Business Combination, Recognized Asset Acquired, Receivable, Current				0.0
Business Combination, Recognized Asset Acquired, Inventory, Current				1.3
Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment				4.7
Goodwill, Acquired During Period				50.7
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill				57.2
Business Combination, Recognized Asset Acquired, Asset				113.9
Business Combination, Recognized Liability Assumed, Other Liability, Current				3.9
Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent				0.0
Business Combination, Recognized Liability Assumed, Liability				3.9
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill				110.0
Business Combination, Recognized Asset Acquired, Prepaid Expense and Other Asset, Current				0.0
Business Combination, Recognized Liability Assumed, Accounts Payable, Current				0.0
Business Combination, Recognized Liability Assumed, Deferred Tax Liability				0.0
Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent				0.0
Tufts Medicine
Business Combination [Line Items]
Business Combination, Recognized Asset Acquired, Receivable, Current				0.0
Business Combination, Recognized Asset Acquired, Inventory, Current				0.0
Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment				0.0
Goodwill, Acquired During Period				73.8
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill				83.2
Business Combination, Recognized Asset Acquired, Asset				157.0
Business Combination, Recognized Liability Assumed, Other Liability, Current				0.0
Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent				0.0
Business Combination, Recognized Liability Assumed, Liability				0.0
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill				157.0
Business Combination, Recognized Asset Acquired, Prepaid Expense and Other Asset, Current				0.0
Business Combination, Recognized Liability Assumed, Accounts Payable, Current				0.0
Business Combination, Recognized Liability Assumed, Deferred Tax Liability				0.0
Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent				0.0
Legacy Health
Business Combination [Line Items]
Business Combination, Recognized Asset Acquired, Receivable, Current				0.0
Business Combination, Recognized Asset Acquired, Inventory, Current				0.0
Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment				3.3
Goodwill, Acquired During Period				49.0
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill				55.2
Business Combination, Recognized Asset Acquired, Asset				107.7
Business Combination, Recognized Liability Assumed, Other Liability, Current				0.0
Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent				0.0
Business Combination, Recognized Liability Assumed, Liability				0.0
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill				107.7
Business Combination, Recognized Asset Acquired, Prepaid Expense and Other Asset, Current				0.2
Business Combination, Recognized Liability Assumed, Accounts Payable, Current				0.0
Business Combination, Recognized Liability Assumed, Deferred Tax Liability				0.0
Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent				$ 0.0
Customer Relationships [Member]
Business Combination [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	15 years	15 years
Non-compete agreements [Member]
Business Combination [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	4 years 10 months 24 days	4 years 10 months 24 days
Customer Relationships [Member]
Business Combination [Line Items]
Finite-lived Intangible Assets Acquired	$ 262.3
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			14 years 4 months 24 days	15 years
Technology-Based Intangible Assets
Business Combination [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			11 years
Non-compete agreements [Member]
Business Combination [Line Items]
Finite-lived Intangible Assets Acquired	$ 53.6
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			5 years	5 years
Trademarks and Trade Names [Member]
Business Combination [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			2 years

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