Quarterly report pursuant to Section 13 or 15(d)

SEGMENT INFORMATION - Schedule of Operating Revenue and Operating Income by Operating Segment (Details)

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SEGMENT INFORMATION - Schedule of Operating Revenue and Operating Income by Operating Segment (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Segment Reporting Information [Line Items]    
Operating revenue $ 1,389.4 $ 1,302.0
Operating income 224.7 205.4
General Corporate Expense    
Segment Reporting Information [Line Items]    
Operating income (154.9) (154.6)
Workforce Solutions    
Segment Reporting Information [Line Items]    
Operating revenue 602.8 596.3
Workforce Solutions | Operating Segments    
Segment Reporting Information [Line Items]    
Operating income 255.1 248.7
U.S. Information Solutions    
Segment Reporting Information [Line Items]    
Operating revenue 465.3 421.7
U.S. Information Solutions | Operating Segments    
Segment Reporting Information [Line Items]    
Operating income 92.6 78.6
International    
Segment Reporting Information [Line Items]    
Operating revenue 321.3 284.0
International | Operating Segments    
Segment Reporting Information [Line Items]    
Operating income $ 31.9 $ 32.7