REVENUES Disaggregated Revenue Table (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	100.00%	100.00%	100.00%	100.00%
Revenues	$ 3,563.5	$ 3,282.0	$ 10,435.9	$ 9,679.5
North America
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	87.00%	87.00%	87.00%	87.00%
Europe [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	9.00%	9.00%	9.00%	9.00%
Other countries [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	4.00%	4.00%	4.00%	4.00%
UNITED STATES
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	83.30%	83.40%	83.50%	83.60%
Revenues	$ 2,968.5	$ 2,738.4	$ 8,713.9	$ 8,091.8
Medicare and Medicaid [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	8.00%	8.00%	8.00%	8.00%
Diagnostics
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	78.00%	78.00%	78.00%	78.00%
Diagnostics \| North America
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	78.00%	78.00%	78.00%	78.00%
Diagnostics \| Europe [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%	0.00%	0.00%
Diagnostics \| Other countries [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%	0.00%	0.00%
Diagnostics \| Client [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	23.00%	24.00%	24.00%	24.00%
Diagnostics \| Client [Member] \| North America
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	23.00%	24.00%	24.00%	24.00%
Diagnostics \| Client [Member] \| Europe [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%	0.00%	0.00%
Diagnostics \| Client [Member] \| Other countries [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%	0.00%	0.00%
Diagnostics \| Self-Pay [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	10.00%	10.00%	10.00%	10.00%
Diagnostics \| Self-Pay [Member] \| North America
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	10.00%	10.00%	10.00%	10.00%
Diagnostics \| Self-Pay [Member] \| Europe [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%	0.00%	0.00%
Diagnostics \| Self-Pay [Member] \| Other countries [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%	0.00%	0.00%
Diagnostics \| Medicare and Medicaid [Member] \| North America
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	8.00%	8.00%	8.00%	8.00%
Diagnostics \| Medicare and Medicaid [Member] \| Europe [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%	0.00%	0.00%
Diagnostics \| Medicare and Medicaid [Member] \| Other countries [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%	0.00%	0.00%
Diagnostics \| Third party [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	37.00%	36.00%	36.00%	36.00%
Diagnostics \| Third party [Member] \| North America
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	37.00%	36.00%	36.00%	36.00%
Diagnostics \| Third party [Member] \| Europe [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%	0.00%	0.00%
Diagnostics \| Third party [Member] \| Other countries [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%	0.00%	0.00%
Biopharma Laboratory Services
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	22.00%	22.00%	22.00%	22.00%
Biopharma Laboratory Services \| Biopharmaceutical and medical device companies [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	22.00%	22.00%	22.00%	22.00%
Biopharma Laboratory Services \| Biopharmaceutical and medical device companies [Member] \| North America
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	9.00%	9.00%	9.00%	9.00%
Biopharma Laboratory Services \| Biopharmaceutical and medical device companies [Member] \| Europe [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	9.00%	9.00%	9.00%	9.00%
Biopharma Laboratory Services \| Biopharmaceutical and medical device companies [Member] \| Other countries [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	4.00%	4.00%	4.00%	4.00%