REVENUE RECOGNITION (Details)	3 Months Ended		6 Months Ended
REVENUE RECOGNITION (Details)	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Segment Reporting Information [Line Items]
Percentage of net revenues	100.00%	100.00%	100.00%	100.00%
Net accounts receivable	100.00%		100.00%		100.00%
DIS business
Segment Reporting Information [Line Items]
Percentage of net revenues	98.00%	97.00%	98.00%	97.00%
Net accounts receivable	98.00%		98.00%		98.00%
DIS business \| Healthcare Insurers
Segment Reporting Information [Line Items]
Percentage of net revenues	40.00%	39.00%	39.00%	39.00%
Net accounts receivable	27.00%		27.00%		26.00%
DIS business \| Healthcare Insurers \| Fee-for-service
Segment Reporting Information [Line Items]
Percentage of net revenues	37.00%	36.00%	36.00%	36.00%
DIS business \| Healthcare Insurers \| Capitated
Segment Reporting Information [Line Items]
Percentage of net revenues	3.00%	3.00%	3.00%	3.00%
DIS business \| Government payers (principally fee-for-service)
Segment Reporting Information [Line Items]
Percentage of net revenues	16.00%	11.00%	16.00%	12.00%
Net accounts receivable	8.00%		8.00%		7.00%
DIS business \| Client Payers
Segment Reporting Information [Line Items]
Percentage of net revenues	30.00%	33.00%	31.00%	33.00%
Net accounts receivable	43.00%		43.00%		45.00%
DIS business \| Patients (including coinsurance and deductible responsibilities)
Segment Reporting Information [Line Items]
Percentage of net revenues	12.00%	14.00%	12.00%	13.00%
Net accounts receivable	20.00%		20.00%		20.00%
DIS business \| Minimum
Segment Reporting Information [Line Items]
Percentage of net revenues	97.00%	97.00%	97.00%	97.00%
All other operating segments \| DS Businesses
Segment Reporting Information [Line Items]
Percentage of net revenues	2.00%	3.00%	2.00%	3.00%
Net accounts receivable	2.00%		2.00%		2.00%