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ACQUISITIONS AND DISPOSITIONS - Narrative (Details) - USD ($) |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 01, 2022 | Apr. 07, 2022 | Sep. 30, 2021 | Oct. 31, 2022 | Dec. 31, 2026 | Oct. 31, 2022 | Oct. 31, 2021 | Dec. 31, 2025 | Dec. 31, 2024 | Sep. 30, 2022 | Oct. 31, 2020
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 2,485,600,000 |  | $ 2,485,600,000 | $ 2,228,900,000 |  |  |  | $ 1,671,400,000
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  |  |  |  | Selling, general and administrative expenses |  |  |  |  |
Technical Solutions |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | 367,400,000 |  | $ 367,400,000 | 162,700,000 |  |  |  | $ 161,500,000
Customer Contracts For Healthcare Technology Management | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Technical Solutions |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sale of customer contracts for clinical engineering services, consideration |  |  |  | 8,500,000 |  | 8,500,000 |  |  |  |  |
Gain on sale of government services business |  |  |  |  |  | 7,600,000 |  |  |  |  |
RavenVolt |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash purchase price | $ 170,000,000 |  |  |  |  |  |  |  |  |  |
Fair value of contingent consideration | 59,000,000 |  |  |  |  |  |  |  |  |  |
Revenues associated with acquisition |  |  |  | 14,700,000 |  | 14,700,000 |  |  |  |  |
Operating profit (loss) associated with acquisition |  |  |  | (200,000) |  | (200,000) |  |  |  |  |
Goodwill | 207,500,000 |  |  |  |  |  |  |  |  |  |
Intangibles acquired | 16,500,000 |  |  |  |  |  |  |  |  |  |
RavenVolt | Forecast |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum contingent consideration payable in future years |  |  |  |  | $ 130,000,000 |  |  | $ 75,000,000 | $ 75,000,000 |  |
RavenVolt | Maximum |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Potential post-closing contingent consideration | $ 280,000,000 |  |  |  |  |  |  |  |  |  |
RavenVolt | Maximum | Forecast |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Potential post-closing contingent consideration |  |  |  |  | $ 280,000,000 |  |  |  |  |  |
Momentum |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues associated with acquisition |  |  |  | 17,600,000 |  | 40,400,000 |  |  |  |  |
Operating profit (loss) associated with acquisition |  |  |  | 1,000,000 |  | 2,400,000 |  |  |  |  |
Aggregate purchase price |  | $ 54,800,000 |  |  |  |  |  |  |  |  |
Goodwill tax deductible amount |  | $ 0 |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | 41,600,000 |  | 41,600,000 |  |  |  |  |
Intangibles acquired |  |  |  | 10,400,000 |  | 10,400,000 |  |  |  |  |
Total assets acquired, excluding goodwill and intangibles |  |  |  | 20,300,000 |  | 20,300,000 |  |  |  |  |
Liabilities assumed |  |  |  | $ 17,600,000 |  | $ 17,600,000 |  |  |  |  |
Able |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues associated with acquisition |  |  |  |  |  |  | 101,100,000 |  |  |  |
Operating profit (loss) associated with acquisition |  |  |  |  |  |  | 4,400,000 |  |  |  |
Aggregate purchase price |  |  | $ 741,700,000 |  |  |  |  |  |  |  |
Goodwill tax deductible amount |  |  |  |  |  |  |  |  |  | $ 0 |
Goodwill |  |  |  |  |  |  | $ 554,000,000.0 |  |  | $ 574,200,000 |
Cash consideration placed in escrow |  |  | 12,100,000 |  |  |  |  |  |  |  |
Cash consideration placed in escrow for indemnification asset |  |  | $ 8,200,000 |  |  |  |  |  |  |  |
Pro forma statutory tax rate |  |  | 28.00% |  |  |  |  |  |  |  |
Able | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from lines of credit |  |  | $ 325,000,000 |  |  |  |  |  |  |  |
Weighted average interest rate |  |  | 1.58% |  |  |  |  |  |  |  |

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