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REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 1,068.3 | $ 875.7 | $ 3,009.1 | $ 2,601.8
Change in revenue | $ 192.6 |  | $ 407.3 |
Change in revenue (as a percent) | 22.00% |  | 16.00% |
Operating Segments | U.S. Information Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 386.3 | 315.5 | $ 1,095.1 | 946.5
Change in revenue | $ 70.8 |  | $ 148.6 |
Change in revenue (as a percent) | 22.00% |  | 16.00% |
Operating Segments | U.S. Information Solutions | Online Information Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 284.7 | 233.0 | $ 800.3 | 696.7
Change in revenue | $ 51.7 |  | $ 103.6 |
Change in revenue (as a percent) | 22.00% |  | 15.00% |
Operating Segments | U.S. Information Solutions | Mortgage Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 55.4 | 36.7 | $ 149.4 | 104.4
Change in revenue | $ 18.7 |  | $ 45.0 |
Change in revenue (as a percent) | 51.00% |  | 43.00% |
Operating Segments | U.S. Information Solutions | Financial Marketing Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 46.2 | 45.8 | $ 145.4 | 145.4
Change in revenue | $ 0.4 |  | $ 0.0 |
Change in revenue (as a percent) | 1.00% |  | 0.00% |
Operating Segments | Workforce Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 376.8 | 240.6 | $ 1,031.4 | 699.2
Change in revenue | $ 136.2 |  | $ 332.2 |
Change in revenue (as a percent) | 57.00% |  | 48.00% |
Operating Segments | Workforce Solutions | Verification Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 301.1 | 185.3 | $ 773.2 | 506.5
Change in revenue | $ 115.8 |  | $ 266.7 |
Change in revenue (as a percent) | 63.00% |  | 53.00% |
Operating Segments | Workforce Solutions | Employer Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 75.7 | 55.3 | $ 258.2 | 192.7
Change in revenue | $ 20.4 |  | $ 65.5 |
Change in revenue (as a percent) | 37.00% |  | 34.00% |
Operating Segments | International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 218.0 | 230.5 | $ 614.6 | 684.6
Change in revenue | $ (12.5) |  | $ (70.0) |
Change in revenue (as a percent) | (5.00%) |  | (10.00%) |
Operating Segments | International | Asia Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 80.2 | 77.4 | $ 215.1 | 226.4
Change in revenue | $ 2.8 |  | $ (11.3) |
Change in revenue (as a percent) | 4.00% |  | (5.00%) |
Operating Segments | International | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 58.7 | 64.8 | $ 173.2 | 199.3
Change in revenue | $ (6.1) |  | $ (26.1) |
Change in revenue (as a percent) | (9.00%) |  | (13.00%) |
Operating Segments | International | Latin America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 40.4 | 49.2 | $ 117.8 | 144.0
Change in revenue | $ (8.8) |  | $ (26.2) |
Change in revenue (as a percent) | (18.00%) |  | (18.00%) |
Operating Segments | International | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 38.7 | 39.1 | $ 108.5 | 114.9
Change in revenue | $ (0.4) |  | $ (6.4) |
Change in revenue (as a percent) | (1.00%) |  | (6.00%) |
Operating Segments | Global Consumer Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 87.2 | $ 89.1 | $ 268.0 | $ 271.5
Change in revenue | $ (1.9) |  | $ (3.5) |
Change in revenue (as a percent) | (2.00%) |  | (1.00%) |

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