Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)

v3.22.4
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
shares in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2022
USD ($)
investment
Dec. 31, 2022
USD ($)
segment
shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
shares
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   $ 12,200,000    
Advertising costs from continuing operations   70,100,000 $ 70,200,000 $ 59,000,000
Depreciation and amortization   568,600,000 489,600,000 399,300,000
Goodwill and intangible asset impairment   0 0 0
Carrying value of investment   74,500,000 56,400,000  
Unrealized gain on investment   13,300,000    
Unrealized loss on investment     64,000,000  
Equity investments | investment 2      
Equity investment gain $ 27,500,000      
Foreign currency transaction gain     2,600,000  
Foreign currency transaction loss   1,800,000   7,500,000
Fair value of debt   4,800,000,000 5,200,000,000  
Long term debt carrying amount   5,300,000,000 5,000,000,000  
Variable interest entity, maximum exposure to loss   300,000 30,200,000  
Redemption premium   0    
Estimate of Fair Value Measurement | Asset Pledged as Collateral with Right | Other Assets Pledging Purpose        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Fixed assets, pledged as collateral     156,400,000  
Property and Equipment        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Depreciation and amortization   $ 323,400,000 304,000,000 $ 249,300,000
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   10 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   10 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   $ 55,300,000 19,800,000  
Restricted cash   27,000,000 28,500,000  
Other Current Liabilities        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Restricted cash   27,000,000 28,500,000  
Legal fees   $ 22,400,000 $ 373,600,000  
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   0.6 0.0 0.4
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 (as a percent)   45.00%    
Cybersecurity Incident | Other Current Liabilities        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Legal fees   $ 5,700,000 $ 350,700,000  
Other Income        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Foreign currency transaction gain   $ 200,000 $ 800,000  
Foreign currency transaction loss       $ 500,000