BUSINESS SEGMENT INFORMATION - Schedule of Segment Reporting Information (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Segment Reporting [Line Items] | ||||
| Revenues | $ 678.2 | $ 710.3 | $ 1,314.7 | $ 1,361.6 |
| Direct costs | 539.0 | 576.8 | 1,051.9 | 1,111.6 |
| Selling, general and administrative expenses | 102.1 | 124.8 | 202.6 | 246.6 |
| Depreciation | 19.6 | 19.6 | 39.4 | 39.1 |
| Goodwill and other asset impairments | 0.0 | 309.1 | 0.0 | 797.9 |
| Operating income (loss) | 14.8 | (330.3) | 11.4 | (850.4) |
| Interest expense | (19.3) | (23.3) | (38.4) | (45.6) |
| Foreign exchange gain (loss) | 3.5 | (19.9) | 13.2 | (25.5) |
| Other, net | (0.2) | 2.8 | 0.3 | 2.8 |
| Loss before income taxes | (1.2) | (370.7) | (13.5) | (918.7) |
| Corporate, non-segment | ||||
| Segment Reporting [Line Items] | ||||
| Corporate costs not included in segment operating income | 7.8 | 21.7 | 19.3 | 39.5 |
| Clinical Services Segment | ||||
| Segment Reporting [Line Items] | ||||
| Amortization | 14.6 | 14.6 | 29.2 | 29.1 |
| Goodwill and other asset impairments | 0.0 | 309.1 | 0.0 | 797.9 |
| Restructuring and other charges | 2.7 | 10.3 | 9.4 | 16.8 |
| Operating income (loss) | 14.8 | (330.3) | 11.4 | (850.4) |
| Interest expense | (19.3) | (23.3) | (38.4) | (45.6) |
| Foreign exchange gain (loss) | 3.5 | (19.9) | 13.2 | (25.5) |
| Other, net | (0.2) | 2.8 | 0.3 | 2.8 |
| Loss before income taxes | (1.2) | (370.7) | (13.5) | (918.7) |
| Clinical Services Segment | Operating segments | ||||
| Segment Reporting [Line Items] | ||||
| Revenues | 678.2 | 710.3 | 1,314.7 | 1,361.6 |
| Pass through costs | 250.8 | 276.3 | 480.7 | 516.2 |
| Direct costs | 288.2 | 298.7 | 571.1 | 592.8 |
| Selling, general and administrative expenses | 94.3 | 104.9 | 183.4 | 209.7 |
| Depreciation | 5.0 | 5.0 | 10.2 | 10.0 |
| Segment operating income | $ 39.9 | $ 25.4 | $ 69.3 | $ 32.9 |
| X | ||||||||||
- Definition Segment Operating Income No definition available.
|
| X | ||||||||||
- Definition The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Cost of product sold and service rendered, excluding depreciation, depletion, and amortization. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount, before tax, of realized and unrealized gain (loss) from foreign currency transaction. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of impairment loss for finite- and indefinite-lived intangible assets, goodwill, and capitalized cost for software to be sold, leased, or marketed. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Amount of interest income (expense) classified as nonoperating. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Excludes Selling, General and Administrative Expense. No definition available.
|
| X | ||||||||||
- Definition The net result for the period of deducting operating expenses from operating revenues. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Amount of income (expense) related to nonoperating activities, classified as other. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|