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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Segment Reporting Information [Line Items]        
Operating revenue $ 1,430.5 $ 1,317.6 $ 2,819.9 $ 2,619.6
Operating income 282.2 236.9 506.9 442.2
General Corporate Expense        
Segment Reporting Information [Line Items]        
Operating income (129.5) (144.9) (284.4) (299.6)
Workforce Solutions        
Segment Reporting Information [Line Items]        
Operating revenue 612.9 582.8 1,215.7 1,179.1
Workforce Solutions | Operating Segments        
Segment Reporting Information [Line Items]        
Operating income 272.7 244.6 527.8 493.4
U.S. Information Solutions        
Segment Reporting Information [Line Items]        
Operating revenue 478.3 445.0 943.6 866.7
U.S. Information Solutions | Operating Segments        
Segment Reporting Information [Line Items]        
Operating income 98.6 102.8 191.2 181.4
International        
Segment Reporting Information [Line Items]        
Operating revenue 339.3 289.8 660.6 573.8
International | Operating Segments        
Segment Reporting Information [Line Items]        
Operating income $ 40.4 $ 34.4 $ 72.3 $ 67.0