Quarterly report pursuant to Section 13 or 15(d)

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

v3.22.1
SEGMENT INFORMATION - Operating Revenue and Operating Income by Operating Segment (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Segment Reporting Information [Line Items]    
Operating revenue $ 1,363.2 $ 1,213.0
Operating income 332.4 306.6
General Corporate Expense    
Segment Reporting Information [Line Items]    
Operating income (134.5) (143.8)
Workforce Solutions    
Segment Reporting Information [Line Items]    
Operating revenue 649.0 487.2
Workforce Solutions | Operating Segments    
Segment Reporting Information [Line Items]    
Operating income 308.4 265.7
U.S. Information Solutions    
Segment Reporting Information [Line Items]    
Operating revenue 432.9 459.4
U.S. Information Solutions | Operating Segments    
Segment Reporting Information [Line Items]    
Operating income 121.5 154.9
International    
Segment Reporting Information [Line Items]    
Operating revenue 281.3 266.4
International | Operating Segments    
Segment Reporting Information [Line Items]    
Operating income $ 37.0 $ 29.8