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REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 1,222.9 | $ 1,068.3 | $ 3,670.7 | $ 3,009.1
Change in revenue | $ 154.6 |  | $ 661.6 |
Change in revenue (as a percent) | 14.00% |  | 22.00% |
Workforce Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 508.0 | 376.8 | $ 1,484.5 | 1,031.4
Change in revenue | $ 131.2 |  | $ 453.1 |
Change in revenue (as a percent) | 35.00% |  | 44.00% |
Workforce Solutions | Verification Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 402.7 | 301.1 | $ 1,182.3 | 773.2
Change in revenue | $ 101.6 |  | $ 409.1 |
Change in revenue (as a percent) | 34.00% |  | 53.00% |
Workforce Solutions | Employer Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 105.3 | 75.7 | $ 302.2 | 258.2
Change in revenue | $ 29.6 |  | $ 44.0 |
Change in revenue (as a percent) | 39.00% |  | 17.00% |
U.S. Information Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 387.8 | 386.3 | $ 1,203.0 | 1,095.1
Change in revenue | $ 1.5 |  | $ 107.9 |
Change in revenue (as a percent) | 0.00% |  | 10.00% |
U.S. Information Solutions | Online Information Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 286.3 | 284.7 | $ 886.2 | 800.3
Change in revenue | $ 1.6 |  | $ 85.9 |
Change in revenue (as a percent) | 1.00% |  | 11.00% |
U.S. Information Solutions | Mortgage Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 46.2 | 55.4 | $ 149.7 | 149.4
Change in revenue | $ (9.2) |  | $ 0.3 |
Change in revenue (as a percent) | (17.00%) |  | 0.00% |
U.S. Information Solutions | Financial Marketing Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 55.3 | 46.2 | $ 167.1 | 145.4
Change in revenue | $ 9.1 |  | $ 21.7 |
Change in revenue (as a percent) | 20.00% |  | 15.00% |
International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 245.4 | 218.0 | $ 737.7 | 614.6
Change in revenue | $ 27.4 |  | $ 123.1 |
Change in revenue (as a percent) | 13.00% |  | 20.00% |
International | Asia Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 88.7 | 80.2 | $ 267.0 | 215.1
Change in revenue | $ 8.5 |  | $ 51.9 |
Change in revenue (as a percent) | 11.00% |  | 24.00% |
International | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 67.7 | 58.7 | $ 204.8 | 173.2
Change in revenue | $ 9.0 |  | $ 31.6 |
Change in revenue (as a percent) | 15.00% |  | 18.00% |
International | Latin America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 44.6 | 40.4 | $ 130.3 | 117.8
Change in revenue | $ 4.2 |  | $ 12.5 |
Change in revenue (as a percent) | 11.00% |  | 11.00% |
International | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 44.4 | 38.7 | $ 135.6 | 108.5
Change in revenue | $ 5.7 |  | $ 27.1 |
Change in revenue (as a percent) | 15.00% |  | 25.00% |
Global Consumer Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 81.7 | $ 87.2 | $ 245.5 | $ 268.0
Change in revenue | $ (5.5) |  | $ (22.5) |
Change in revenue (as a percent) | (6.00%) |  | (8.00%) |

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