Annual report pursuant to Section 13 and 15(d)

REVENUE - Disaggregation of Revenue (Details)

v3.19.3.a.u2
REVENUE - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]                      
Operating revenue $ 905.8 $ 875.7 $ 880.0 $ 846.1 $ 835.3 $ 834.2 $ 876.9 $ 865.7 $ 3,507.6 $ 3,412.1 $ 3,362.2
Change in operating revenue                 95.5 $ 49.9  
Change in operating revenue, as a percent                   3.00% 1.00%
Canada                      
Disaggregation of Revenue [Line Items]                      
Operating revenue                 170.0 $ 158.5 $ 148.9
Total U.S. Information Solutions                      
Disaggregation of Revenue [Line Items]                      
Operating revenue                 1,277.4 1,247.3 $ 1,262.7
Change in operating revenue                 30.1 $ (15.4)  
Change in operating revenue, as a percent                   2.00% (1.00%)
Total U.S. Information Solutions | Online Information Solutions                      
Disaggregation of Revenue [Line Items]                      
Operating revenue                 924.1 $ 877.5 $ 889.6
Change in operating revenue                 46.6 $ (12.1)  
Change in operating revenue, as a percent                   5.00% (1.00%)
Total U.S. Information Solutions | Mortgage Solutions                      
Disaggregation of Revenue [Line Items]                      
Operating revenue                 136.9 $ 153.6 $ 148.9
Change in operating revenue                 (16.7) $ 4.7  
Change in operating revenue, as a percent                   (11.00%) 3.00%
Total U.S. Information Solutions | Financial Marketing Services                      
Disaggregation of Revenue [Line Items]                      
Operating revenue                 216.4 $ 216.2 $ 224.2
Change in operating revenue                 0.2 $ (8.0)  
Change in operating revenue, as a percent                   0.00% (4.00%)
Workforce Solutions                      
Disaggregation of Revenue [Line Items]                      
Operating revenue                 949.7 $ 826.8 $ 764.2
Change in operating revenue                 122.9 $ 62.6  
Change in operating revenue, as a percent                   15.00% 8.00%
Workforce Solutions | Verification Services                      
Disaggregation of Revenue [Line Items]                      
Operating revenue                 700.1 $ 567.0 $ 501.5
Change in operating revenue                 133.1 $ 65.5  
Change in operating revenue, as a percent                   23.00% 13.00%
Workforce Solutions | Employer Services                      
Disaggregation of Revenue [Line Items]                      
Operating revenue                 249.6 $ 259.8 $ 262.7
Change in operating revenue                 (10.2) $ (2.9)  
Change in operating revenue, as a percent                   (4.00%) (1.00%)
International                      
Disaggregation of Revenue [Line Items]                      
Operating revenue                 920.6 $ 966.2 $ 932.3
Change in operating revenue                 (45.6) $ 33.9  
Change in operating revenue, as a percent                   (5.00%) 4.00%
International | Asia Pacific                      
Disaggregation of Revenue [Line Items]                      
Operating revenue                 300.1 $ 325.6 $ 308.9
Change in operating revenue                 (25.5) $ 16.7  
Change in operating revenue, as a percent                   (8.00%) 5.00%
International | Europe                      
Disaggregation of Revenue [Line Items]                      
Operating revenue                 275.6 $ 287.3 $ 273.8
Change in operating revenue                 (11.7) $ 13.5  
Change in operating revenue, as a percent                   (4.00%) 5.00%
International | Latin America                      
Disaggregation of Revenue [Line Items]                      
Operating revenue                 190.5 $ 206.6 $ 213.6
Change in operating revenue                 (16.1) $ (7.0)  
Change in operating revenue, as a percent                   (8.00%) (3.00%)
International | Canada                      
Disaggregation of Revenue [Line Items]                      
Operating revenue                 154.4 $ 146.7 $ 136.0
Change in operating revenue                 7.7 $ 10.7  
Change in operating revenue, as a percent                   5.00% 8.00%
Global Consumer Solutions                      
Disaggregation of Revenue [Line Items]                      
Operating revenue                 359.9 $ 371.8 $ 403.0
Change in operating revenue                 $ (11.9) $ (31.2)  
Change in operating revenue, as a percent                   (3.00%) (8.00%)