Annual report pursuant to Section 13 and 15(d)

REVENUE - Disaggregation of Revenue (Details)

v3.20.4
REVENUE - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]                      
Operating revenue $ 1,118.5 $ 1,068.3 $ 982.8 $ 957.9 $ 905.8 $ 875.7 $ 880.0 $ 846.1 $ 4,127.5 $ 3,507.6 $ 3,412.1
Change in operating revenue                 619.9 $ 95.5  
Change in operating revenue, as a percent                   18.00% 3.00%
Canada                      
Disaggregation of Revenue [Line Items]                      
Operating revenue                 168.4 $ 170.0 $ 158.5
Total U.S. Information Solutions                      
Disaggregation of Revenue [Line Items]                      
Operating revenue                 1,482.5 1,277.4 $ 1,247.3
Change in operating revenue                 205.1 $ 30.1  
Change in operating revenue, as a percent                   16.00% 2.00%
Total U.S. Information Solutions | Online Information Solutions                      
Disaggregation of Revenue [Line Items]                      
Operating revenue                 1,067.7 $ 924.1 $ 877.5
Change in operating revenue                 143.6 $ 46.6  
Change in operating revenue, as a percent                   16.00% 5.00%
Total U.S. Information Solutions | Mortgage Solutions                      
Disaggregation of Revenue [Line Items]                      
Operating revenue                 199.8 $ 136.9 $ 153.6
Change in operating revenue                 62.9 $ (16.7)  
Change in operating revenue, as a percent                   46.00% (11.00%)
Total U.S. Information Solutions | Financial Marketing Services                      
Disaggregation of Revenue [Line Items]                      
Operating revenue                 215.0 $ 216.4 $ 216.2
Change in operating revenue                 (1.4) $ 0.2  
Change in operating revenue, as a percent                   (1.00%) 0.00%
Workforce Solutions                      
Disaggregation of Revenue [Line Items]                      
Operating revenue                 1,437.9 $ 949.7 $ 826.8
Change in operating revenue                 488.2 $ 122.9  
Change in operating revenue, as a percent                   51.00% 15.00%
Workforce Solutions | Verification Services                      
Disaggregation of Revenue [Line Items]                      
Operating revenue                 1,103.2 $ 700.1 $ 567.0
Change in operating revenue                 403.1 $ 133.1  
Change in operating revenue, as a percent                   58.00% 23.00%
Workforce Solutions | Employer Services                      
Disaggregation of Revenue [Line Items]                      
Operating revenue                 334.7 $ 249.6 $ 259.8
Change in operating revenue                 85.1 $ (10.2)  
Change in operating revenue, as a percent                   34.00% (4.00%)
International                      
Disaggregation of Revenue [Line Items]                      
Operating revenue                 862.1 $ 920.6 $ 966.2
Change in operating revenue                 (58.5) $ (45.6)  
Change in operating revenue, as a percent                   (6.00%) (5.00%)
International | Asia Pacific                      
Disaggregation of Revenue [Line Items]                      
Operating revenue                 296.5 $ 300.1 $ 325.6
Change in operating revenue                 (3.6) $ (25.5)  
Change in operating revenue, as a percent                   (1.00%) (8.00%)
International | Europe                      
Disaggregation of Revenue [Line Items]                      
Operating revenue                 255.7 $ 275.6 $ 287.3
Change in operating revenue                 (19.9) $ (11.7)  
Change in operating revenue, as a percent                   (7.00%) (4.00%)
International | Latin America                      
Disaggregation of Revenue [Line Items]                      
Operating revenue                 160.3 $ 190.5 $ 206.6
Change in operating revenue                 (30.2) $ (16.1)  
Change in operating revenue, as a percent                   (16.00%) (8.00%)
International | Canada                      
Disaggregation of Revenue [Line Items]                      
Operating revenue                 149.6 $ 154.4 $ 146.7
Change in operating revenue                 (4.8) $ 7.7  
Change in operating revenue, as a percent                   (3.00%) 5.00%
Global Consumer Solutions                      
Disaggregation of Revenue [Line Items]                      
Operating revenue                 345.0 $ 359.9 $ 371.8
Change in operating revenue                 $ (14.9) $ (11.9)  
Change in operating revenue, as a percent                   (4.00%) (3.00%)