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REVENUE (Tables) | 3 Months Ended
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Mar. 31, 2024
Disaggregation of Revenue [Line Items] |
Financing Receivable, Allowance for Credit Loss [Table Text Block] | The rollforward for the allowance for credit losses for the three months ended March 31, 2024, was as follows:
| Accounts Receivable |  | Unbilled Services |  | Note and Other Receivables |  | Total
Balance as of December 31, 2023 | $ | 32.7 |  |  | $ | 7.5 |  |  | $ | 0.7 |  |  | $ | 40.9 |
Plus, credit loss expense | 2.4 |  |  | — |  |  | — |  |  | 2.4 |
Less, write offs | 0.9 |  |  | 0.1 |  |  | — |  |  | 1.0 |
Balance as of March 31, 2024 | $ | 34.2 |  |  | $ | 7.4 |  |  | $ | 0.7 |  |  | $ | 42.3 |
Contract with Customer, Asset and Liability [Table Text Block] |
| March 31, 2024 |  | December 31, 2023
Dx accounts receivable | $ | 1,260.9 |  |  | $ | 1,135.2 |
BLS accounts receivable | 857.0 |  |  | 810.8 |
Less BLS allowance for doubtful accounts | (34.2) |  |  | (32.7) |
Accounts receivable | $ | 2,083.7 |  |  | $ | 1,913.3 |
Gross unbilled services | $ | 127.8 |  |  | $ | 192.9 |
Less reserve for unbilled services | (7.4) |  |  | (7.5) |
Unbilled services | $ | 120.4 |  |  | $ | 185.4 |
Unearned revenue | $ | 377.5 |  |  | $ | 421.7 |
Disaggregation of Revenue [Table Text Block] | The Company's revenues by segment and by payers/customer groups for the three months ended March 31, 2024, and 2023, were as follows:
| For the Three Months Ended March 31, 2024 |  | For the Three Months Ended March 31, 2023
| North America |  | Europe |  | Other |  | Total |  | North America |  | Europe |  | Other |  | Total
Payer/Customer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dx |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Clients | 25 | % |  | — | % |  | — | % |  | 25 | % |  | 25 | % |  | — | % |  | — | % |  | 25 | %
Patients | 10 | % |  | — | % |  | — | % |  | 10 | % |  | 9 | % |  | — | % |  | — | % |  | 9 | %
Medicare and Medicaid | 8 | % |  | — | % |  | — | % |  | 8 | % |  | 8 | % |  | — | % |  | — | % |  | 8 | %
Third party | 35 | % |  | — | % |  | — | % |  | 35 | % |  | 36 | % |  | — | % |  | — | % |  | 36 | %
Total Dx revenues by payer | 78 | % |  | — | % |  | — | % |  | 78 | % |  | 78 | % |  | — | % |  | — | % |  | 78 | %
BLS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pharmaceutical, biotechnology and medical device companies | 9 | % |  | 9 | % |  | 4 | % |  | 22 | % |  | 9 | % |  | 9 | % |  | 4 | % |  | 22 | %
Total revenues | 87 | % |  | 9 | % |  | 4 | % |  | 100 | % |  | 87 | % |  | 9 | % |  | 4 | % |  | 100 | %
Revenues in the U.S. were $2,654.6 (83.6%) and $2,557.4 (84.2%) for the three months ended March 31, 2024, and 2023, respectively.

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