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REVENUE (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disaggregation of Revenue [Line Items] |  |  |
Operating revenue | $ 5,265.2 | $ 5,122.2 | $ 4,923.9
Change in operating revenue | 143.0 | $ 198.3 |
Change in operating revenue (as a percent) |  | 3.00% | 4.00%
Canada |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating revenue | 259.6 | $ 256.1 | $ 250.0
Total Workforce Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating revenue | 2,315.8 | 2,325.4 | $ 2,035.4
Change in operating revenue | (9.6) | $ 290.0 |
Change in operating revenue (as a percent) |  | 0.00% | 14.00%
Total Workforce Solutions | Verification Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating revenue | 1,846.2 | $ 1,871.0 | $ 1,608.9
Change in operating revenue | (24.8) | $ 262.1 |
Change in operating revenue (as a percent) |  | (1.00%) | 16.00%
Total Workforce Solutions | Employer Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating revenue | 469.6 | $ 454.4 | $ 426.5
Change in operating revenue | 15.2 | $ 27.9 |
Change in operating revenue (as a percent) |  | 3.00% | 7.00%
Total U.S. Information Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating revenue | 1,720.4 | $ 1,657.7 | $ 1,786.7
Change in operating revenue | 62.7 | $ (129.0) |
Change in operating revenue (as a percent) |  | 4.00% | (7.00%)
Total U.S. Information Solutions | Online Information Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating revenue | 1,375.2 | $ 1,295.4 | $ 1,349.8
Change in operating revenue | 79.8 | $ (54.4) |
Change in operating revenue (as a percent) |  | 6.00% | (4.00%)
Total U.S. Information Solutions | Mortgage Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating revenue | 113.7 | $ 138.3 | $ 190.4
Change in operating revenue | (24.6) | $ (52.1) |
Change in operating revenue (as a percent) |  | (18.00%) | (27.00%)
Total U.S. Information Solutions | Financial Marketing Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating revenue | 231.5 | $ 224.0 | $ 246.5
Change in operating revenue | 7.5 | $ (22.5) |
Change in operating revenue (as a percent) |  | 3.00% | (9.00%)
International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating revenue | 1,229.0 | $ 1,139.1 | $ 1,101.8
Change in operating revenue | 89.9 | $ 37.3 |
Change in operating revenue (as a percent) |  | 8.00% | 3.00%
International | Asia Pacific |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating revenue | 345.3 | $ 348.4 | $ 356.0
Change in operating revenue | (3.1) | $ (7.6) |
Change in operating revenue (as a percent) |  | (1.00%) | (2.00%)
International | Europe |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating revenue | 333.2 | $ 327.8 | $ 319.9
Change in operating revenue | 5.4 | $ 7.9 |
Change in operating revenue (as a percent) |  | 2.00% | 2.00%
International | Latin America |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating revenue | 290.9 | $ 206.8 | $ 175.9
Change in operating revenue | 84.1 | $ 30.9 |
Change in operating revenue (as a percent) |  | 41.00% | 18.00%
International | Canada |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating revenue | 259.6 | $ 256.1 | $ 250.0
Change in operating revenue | $ 3.5 | $ 6.1 |
Change in operating revenue (as a percent) |  | 1.00% | 2.00%

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