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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) shares in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 USD ($) | Dec. 31, 2025 USD ($) segment shares | Dec. 31, 2024 USD ($) shares | Dec. 31, 2023 USD ($) shares | Aug. 07, 2023 USD ($)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Number of reportable segments | segment |  | 3 |  |  |
Number of operating segments | segment |  | 3 |  |  |
Contract assets |  | $ 22,600,000 |  |  |
Advertising costs from continuing operations |  | 70,100,000 | $ 60,700,000 | $ 67,000,000.0 |
Restricted cash |  | $ 31,900,000 | $ 48,300,000 |  |
Restricted Cash and Cash Equivalent, Statement of Financial Position [Extensible Enumeration] |  | Other current assets | Other current assets |  |
Depreciation and amortization |  | $ 726,900,000 | $ 680,600,000 | 619,800,000 |
Goodwill and intangible asset impairment |  | 0 | 0 | 0 |
Carrying value of investment |  |  |  |  | $ 88,900,000
Unrealized gain on investment |  |  |  | 7,000,000.0 |
Equity investment gain | $ 6,200,000 |  |  |  |
Foreign currency transaction loss |  | 3,400,000 | 4,500,000 | 3,600,000 |
Fair value of debt |  | 4,300,000,000 | 4,500,000,000 |  |
Long term debt carrying amount |  | 4,400,000,000 | 4,800,000,000 |  |
Variable interest entity, maximum exposure to loss |  | 300,000 | 300,000 |  |
Redemption premium |  | 0 |  |  |
Property and Equipment |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Depreciation and amortization |  | $ 469,300,000 | $ 408,700,000 | $ 360,100,000 |
Minimum | Computer Software Intangible Asset |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Property, plant and equipment useful life |  | 3 years |  |  |
Maximum | Computer Software Intangible Asset |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Property, plant and equipment useful life |  | 7 years |  |  |
Data Processing Equipment Capitalized Internal Use Software and Systems Costs | Minimum |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Property, plant and equipment useful life |  | 3 years |  |  |
Data Processing Equipment Capitalized Internal Use Software and Systems Costs | Maximum |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Property, plant and equipment useful life |  | 7 years |  |  |
Building |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Property, plant and equipment useful life |  | 40 years |  |  |
Other Capitalized Property Plant and Equipment | Minimum |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Property, plant and equipment useful life |  | 3 years |  |  |
Other Capitalized Property Plant and Equipment | Maximum |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Property, plant and equipment useful life |  | 7 years |  |  |
Stock Options |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Antidilutive stock options excluded from computation of earnings per share (in shares) | shares |  | 0.0 | 0.0 | 0.7 |
Total Workforce Solutions | Revenue Benchmark | Segment Concentration Risk |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Largest segment's percent of total operating revenue |  | 43.00% |  |  |
Other Income |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Foreign currency transaction loss |  | $ 3,300,000 | $ 1,100,000 | $ 3,800,000 |

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