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REVENUE (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disaggregation of Revenue [Line Items] |  |  |
Operating revenue | $ 5,122.2 | $ 4,923.9 | $ 4,127.5
Change in operating revenue | 198.3 | $ 796.4 |
Change in operating revenue (as a percent) |  | 4.00% | 19.00%
Canada |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating revenue | 256.1 | $ 250.0 | $ 212.6
Total Workforce Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating revenue | 2,325.4 | 2,035.4 | $ 1,461.7
Change in operating revenue | 290.0 | $ 573.7 |
Change in operating revenue (as a percent) |  | 14.00% | 39.00%
Total Workforce Solutions | Verification Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating revenue | 1,871.0 | $ 1,608.9 | $ 1,103.2
Change in operating revenue | 262.1 | $ 505.7 |
Change in operating revenue (as a percent) |  | 16.00% | 46.00%
Total Workforce Solutions | Employer Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating revenue | 454.4 | $ 426.5 | $ 358.5
Change in operating revenue | 27.9 | $ 68.0 |
Change in operating revenue (as a percent) |  | 7.00% | 19.00%
Total U.S. Information Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating revenue | 1,657.7 | $ 1,786.7 | $ 1,711.2
Change in operating revenue | (129.0) | $ 75.5 |
Change in operating revenue (as a percent) |  | (7.00%) | 4.00%
Total U.S. Information Solutions | Online Information Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating revenue | 1,295.4 | $ 1,349.8 | $ 1,296.4
Change in operating revenue | (54.4) | $ 53.4 |
Change in operating revenue (as a percent) |  | (4.00%) | 4.00%
Total U.S. Information Solutions | Mortgage Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating revenue | 138.3 | $ 190.4 | $ 199.8
Change in operating revenue | (52.1) | $ (9.4) |
Change in operating revenue (as a percent) |  | (27.00%) | (5.00%)
Total U.S. Information Solutions | Financial Marketing Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating revenue | 224.0 | $ 246.5 | $ 215.0
Change in operating revenue | (22.5) | $ 31.5 |
Change in operating revenue (as a percent) |  | (9.00%) | 15.00%
International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating revenue | 1,139.1 | $ 1,101.8 | $ 954.6
Change in operating revenue | 37.3 | $ 147.2 |
Change in operating revenue (as a percent) |  | 3.00% | 15.00%
International | Asia Pacific |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating revenue | 348.4 | $ 356.0 | $ 296.5
Change in operating revenue | (7.6) | $ 59.5 |
Change in operating revenue (as a percent) |  | (2.00%) | 20.00%
International | Europe |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating revenue | 327.8 | $ 319.9 | $ 285.2
Change in operating revenue | 7.9 | $ 34.7 |
Change in operating revenue (as a percent) |  | 2.00% | 12.00%
International | Latin America |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating revenue | 206.8 | $ 175.9 | $ 160.3
Change in operating revenue | 30.9 | $ 15.6 |
Change in operating revenue (as a percent) |  | 18.00% | 10.00%
International | Canada |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating revenue | 256.1 | $ 250.0 | $ 212.6
Change in operating revenue | $ 6.1 | $ 37.4 |
Change in operating revenue (as a percent) |  | 2.00% | 18.00%

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