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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) shares in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) investment | Dec. 31, 2023 USD ($) segment shares | Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 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 |  |  | $ 23,300,000 |  |  |
Advertising costs from continuing operations |  |  | 67,000,000 | $ 70,100,000 | $ 70,200,000 |
Depreciation and amortization |  |  | 619,800,000 | 568,600,000 | 489,600,000 |
Goodwill and intangible asset impairment |  |  | 0 | 0 | 0 |
Carrying value of investment |  |  |  | 74,500,000 | 56,400,000 | $ 88,900,000
Unrealized gain on investment |  |  | 7,000,000 |  |  |
Unrealized loss on investment |  |  |  | 13,300,000 | 64,000,000 |
Equity investment gain | $ 6,200,000 | $ 27,500,000 |  |  |  |
Equity investments | investment |  | 2 |  |  |  |
Foreign currency transaction loss |  |  | 3,600,000 | 1,800,000 |  |
Foreign currency transaction gain |  |  |  |  | 2,600,000 |
Fair value of debt |  |  | 5,300,000,000 | 4,800,000,000 |  |
Long term debt carrying amount |  |  | 5,500,000,000 | 5,300,000,000 |  |
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 |  |  | $ 360,100,000 | 323,400,000 | $ 304,000,000 |
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 |  |  |
Other Current Assets |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Income taxes receivable, current |  |  | $ 40,900,000 | 55,300,000 |  |
Restricted cash |  |  | 34,500,000 | 27,000,000 |  |
Other Current Liabilities |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Restricted cash |  |  | 34,500,000 | 27,000,000 |  |
Legal fees |  |  | $ 79,600,000 | $ 71,300,000 |  |
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 |  |  | 0.7 | 0.6 | 0.0 |
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 |  |  | 44.00% |  |  |
Other Income |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Foreign currency transaction loss |  |  | $ 3,800,000 |  |  |
Foreign currency transaction gain |  |  |  | $ 200,000 | $ 800,000 |

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