Annual report [Section 13 and 15(d), not S-K Item 405]

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)

v3.25.4
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