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 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Information [Line Items]        
Operating revenue $ 1,441.8 $ 1,319.1 $ 4,261.7 $ 3,938.7
Operating income 247.1 246.4 754.0 688.5
General Corporate Expense        
Segment Reporting Information [Line Items]        
Operating income (166.7) (124.7) (451.1) (424.4)
Workforce Solutions        
Segment Reporting Information [Line Items]        
Operating revenue 620.0 577.2 1,835.6 1,756.3
Workforce Solutions | Operating Segments        
Segment Reporting Information [Line Items]        
Operating income 267.6 241.2 795.4 734.6
U.S. Information Solutions        
Segment Reporting Information [Line Items]        
Operating revenue 476.9 426.0 1,420.5 1,292.7
U.S. Information Solutions | Operating Segments        
Segment Reporting Information [Line Items]        
Operating income 98.1 89.7 289.3 271.1
International        
Segment Reporting Information [Line Items]        
Operating revenue 344.9 315.9 1,005.6 889.7
International | Operating Segments        
Segment Reporting Information [Line Items]        
Operating income $ 48.1 $ 40.2 $ 120.4 $ 107.2