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REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 1,363.2 | $ 1,213.0
Change in revenue | $ 150.2 |
Change in revenue (as a percent) | 12.00% |
Workforce Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 649.0 | 487.2
Change in revenue | $ 161.8 |
Change in revenue (as a percent) | 33.00% |
Workforce Solutions | Verification Services |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 513.3 | 385.1
Change in revenue | $ 128.2 |
Change in revenue (as a percent) | 33.00% |
Workforce Solutions | Employer Services |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 135.7 | 102.1
Change in revenue | $ 33.6 |
Change in revenue (as a percent) | 33.00% |
U.S. Information Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 432.9 | 459.4
Change in revenue | $ (26.5) |
Change in revenue (as a percent) | (6.00%) |
U.S. Information Solutions | Online Information Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 343.8 | 352.0
Change in revenue | $ (8.2) |
Change in revenue (as a percent) | (2.00%) |
U.S. Information Solutions | Mortgage Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 43.4 | 54.1
Change in revenue | $ (10.7) |
Change in revenue (as a percent) | (20.00%) |
U.S. Information Solutions | Financial Marketing Services |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 45.7 | 53.3
Change in revenue | $ (7.6) |
Change in revenue (as a percent) | (14.00%) |
International |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 281.3 | 266.4
Change in revenue | $ 14.9 |
Change in revenue (as a percent) | 6.00% |
International | Asia Pacific |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 86.5 | 87.0
Change in revenue | $ (0.5) |
Change in revenue (as a percent) | (1.00%) |
International | Europe |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 85.8 | 77.0
Change in revenue | $ 8.8 |
Change in revenue (as a percent) | 11.00% |
International | Canada |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 61.6 | 60.7
Change in revenue | $ 0.9 |
Change in revenue (as a percent) | 1.00% |
International | Latin America |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 47.4 | $ 41.7
Change in revenue | $ 5.7 |
Change in revenue (as a percent) | 14.00% |

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