Annual report pursuant to Section 13 and 15(d)

REVENUE (Details)

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REVENUE (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]      
Operating revenue $ 4,923.9 $ 4,127.5 $ 3,507.6
Change in operating revenue 796.4 $ 619.9  
Change in operating revenue (as a percent)   19.00% 18.00%
Canada      
Disaggregation of Revenue [Line Items]      
Operating revenue 250.0 $ 212.6 $ 210.9
Total Workforce Solutions      
Disaggregation of Revenue [Line Items]      
Operating revenue 2,035.4 1,461.7 $ 971.1
Change in operating revenue 573.7 $ 490.6  
Change in operating revenue (as a percent)   39.00% 51.00%
Total Workforce Solutions | Verification Services      
Disaggregation of Revenue [Line Items]      
Operating revenue 1,608.9 $ 1,103.2 $ 700.1
Change in operating revenue 505.7 $ 403.1  
Change in operating revenue (as a percent)   46.00% 58.00%
Total Workforce Solutions | Employer Services      
Disaggregation of Revenue [Line Items]      
Operating revenue 426.5 $ 358.5 $ 271.0
Change in operating revenue 68.0 $ 87.5  
Change in operating revenue (as a percent)   19.00% 32.00%
Total U.S. Information Solutions      
Disaggregation of Revenue [Line Items]      
Operating revenue 1,786.7 $ 1,711.2 $ 1,531.2
Change in operating revenue 75.5 $ 180.0  
Change in operating revenue (as a percent)   4.00% 12.00%
Total U.S. Information Solutions | Online Information Solutions      
Disaggregation of Revenue [Line Items]      
Operating revenue 1,349.8 $ 1,296.4 $ 1,177.9
Change in operating revenue 53.4 $ 118.5  
Change in operating revenue (as a percent)   4.00% 10.00%
Total U.S. Information Solutions | Mortgage Solutions      
Disaggregation of Revenue [Line Items]      
Operating revenue 190.4 $ 199.8 $ 136.9
Change in operating revenue (9.4) $ 62.9  
Change in operating revenue (as a percent)   (5.00%) 46.00%
Total U.S. Information Solutions | Financial Marketing Services      
Disaggregation of Revenue [Line Items]      
Operating revenue 246.5 $ 215.0 $ 216.4
Change in operating revenue 31.5 $ (1.4)  
Change in operating revenue (as a percent)   15.00% (1.00%)
International      
Disaggregation of Revenue [Line Items]      
Operating revenue 1,101.8 $ 954.6 $ 1,005.3
Change in operating revenue 147.2 $ (50.7)  
Change in operating revenue (as a percent)   15.00% (5.00%)
International | Asia Pacific      
Disaggregation of Revenue [Line Items]      
Operating revenue 356.0 $ 296.5 $ 300.1
Change in operating revenue 59.5 $ (3.6)  
Change in operating revenue (as a percent)   20.00% (1.00%)
International | Europe      
Disaggregation of Revenue [Line Items]      
Operating revenue 319.9 $ 285.2 $ 303.8
Change in operating revenue 34.7 $ (18.6)  
Change in operating revenue (as a percent)   12.00% (6.00%)
International | Latin America      
Disaggregation of Revenue [Line Items]      
Operating revenue 175.9 $ 160.3 $ 190.5
Change in operating revenue 15.6 $ (30.2)  
Change in operating revenue (as a percent)   10.00% (16.00%)
International | Canada      
Disaggregation of Revenue [Line Items]      
Operating revenue 250.0 $ 212.6 $ 210.9
Change in operating revenue $ 37.4 $ 1.7  
Change in operating revenue (as a percent)   18.00% 1.00%