Quarterly report pursuant to Section 13 or 15(d)

REVENUE - Disaggregation of Revenue (Details)

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REVENUE - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Disaggregation of Revenue [Line Items]    
Operating revenue $ 1,389.4 $ 1,302.0
Change in revenue $ 87.4  
Change in revenue (as a percent) 7.00%  
Workforce Solutions    
Disaggregation of Revenue [Line Items]    
Operating revenue $ 602.8 596.3
Change in revenue $ 6.5  
Change in revenue (as a percent) 1.00%  
Workforce Solutions | Verification Services    
Disaggregation of Revenue [Line Items]    
Operating revenue $ 476.5 455.8
Change in revenue $ 20.7  
Change in revenue (as a percent) 5.00%  
Workforce Solutions | Employer Services    
Disaggregation of Revenue [Line Items]    
Operating revenue $ 126.3 140.5
Change in revenue $ (14.2)  
Change in revenue (as a percent) (10.00%)  
U.S. Information Solutions    
Disaggregation of Revenue [Line Items]    
Operating revenue $ 465.3 421.7
Change in revenue $ 43.6  
Change in revenue (as a percent) 10.00%  
U.S. Information Solutions | Online Information Solutions    
Disaggregation of Revenue [Line Items]    
Operating revenue $ 380.2 341.0
Change in revenue $ 39.2  
Change in revenue (as a percent) 12.00%  
U.S. Information Solutions | Mortgage Solutions    
Disaggregation of Revenue [Line Items]    
Operating revenue $ 38.0 33.3
Change in revenue $ 4.7  
Change in revenue (as a percent) 14.00%  
U.S. Information Solutions | Financial Marketing Services    
Disaggregation of Revenue [Line Items]    
Operating revenue $ 47.1 47.4
Change in revenue $ (0.3)  
Change in revenue (as a percent) (1.00%)  
International    
Disaggregation of Revenue [Line Items]    
Operating revenue $ 321.3 284.0
Change in revenue $ 37.3  
Change in revenue (as a percent) 13.00%  
International | Asia Pacific    
Disaggregation of Revenue [Line Items]    
Operating revenue $ 78.2 89.9
Change in revenue $ (11.7)  
Change in revenue (as a percent) (13.00%)  
International | Europe    
Disaggregation of Revenue [Line Items]    
Operating revenue $ 86.2 75.7
Change in revenue $ 10.5  
Change in revenue (as a percent) 14.00%  
International | Canada    
Disaggregation of Revenue [Line Items]    
Operating revenue $ 65.8 63.1
Change in revenue $ 2.7  
Change in revenue (as a percent) 4.00%  
International | Latin America    
Disaggregation of Revenue [Line Items]    
Operating revenue $ 91.1 $ 55.3
Change in revenue $ 35.8  
Change in revenue (as a percent) 65.00%