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REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue | $ 1,118.5 | $ 1,068.3 | $ 982.8 | $ 957.9 | $ 905.8 | $ 875.7 | $ 880.0 | $ 846.1 | $ 4,127.5 | $ 3,507.6 | $ 3,412.1
Change in operating revenue |  |  |  |  |  |  |  |  | 619.9 | $ 95.5 |
Change in operating revenue, as a percent |  |  |  |  |  |  |  |  |  | 18.00% | 3.00%
Canada |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 168.4 | $ 170.0 | $ 158.5
Total U.S. Information Solutions |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 1,482.5 | 1,277.4 | $ 1,247.3
Change in operating revenue |  |  |  |  |  |  |  |  | 205.1 | $ 30.1 |
Change in operating revenue, as a percent |  |  |  |  |  |  |  |  |  | 16.00% | 2.00%
Total U.S. Information Solutions | Online Information Solutions |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 1,067.7 | $ 924.1 | $ 877.5
Change in operating revenue |  |  |  |  |  |  |  |  | 143.6 | $ 46.6 |
Change in operating revenue, as a percent |  |  |  |  |  |  |  |  |  | 16.00% | 5.00%
Total U.S. Information Solutions | Mortgage Solutions |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 199.8 | $ 136.9 | $ 153.6
Change in operating revenue |  |  |  |  |  |  |  |  | 62.9 | $ (16.7) |
Change in operating revenue, as a percent |  |  |  |  |  |  |  |  |  | 46.00% | (11.00%)
Total U.S. Information Solutions | Financial Marketing Services |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 215.0 | $ 216.4 | $ 216.2
Change in operating revenue |  |  |  |  |  |  |  |  | (1.4) | $ 0.2 |
Change in operating revenue, as a percent |  |  |  |  |  |  |  |  |  | (1.00%) | 0.00%
Workforce Solutions |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 1,437.9 | $ 949.7 | $ 826.8
Change in operating revenue |  |  |  |  |  |  |  |  | 488.2 | $ 122.9 |
Change in operating revenue, as a percent |  |  |  |  |  |  |  |  |  | 51.00% | 15.00%
Workforce Solutions | Verification Services |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 1,103.2 | $ 700.1 | $ 567.0
Change in operating revenue |  |  |  |  |  |  |  |  | 403.1 | $ 133.1 |
Change in operating revenue, as a percent |  |  |  |  |  |  |  |  |  | 58.00% | 23.00%
Workforce Solutions | Employer Services |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 334.7 | $ 249.6 | $ 259.8
Change in operating revenue |  |  |  |  |  |  |  |  | 85.1 | $ (10.2) |
Change in operating revenue, as a percent |  |  |  |  |  |  |  |  |  | 34.00% | (4.00%)
International |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 862.1 | $ 920.6 | $ 966.2
Change in operating revenue |  |  |  |  |  |  |  |  | (58.5) | $ (45.6) |
Change in operating revenue, as a percent |  |  |  |  |  |  |  |  |  | (6.00%) | (5.00%)
International | Asia Pacific |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 296.5 | $ 300.1 | $ 325.6
Change in operating revenue |  |  |  |  |  |  |  |  | (3.6) | $ (25.5) |
Change in operating revenue, as a percent |  |  |  |  |  |  |  |  |  | (1.00%) | (8.00%)
International | Europe |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 255.7 | $ 275.6 | $ 287.3
Change in operating revenue |  |  |  |  |  |  |  |  | (19.9) | $ (11.7) |
Change in operating revenue, as a percent |  |  |  |  |  |  |  |  |  | (7.00%) | (4.00%)
International | Latin America |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 160.3 | $ 190.5 | $ 206.6
Change in operating revenue |  |  |  |  |  |  |  |  | (30.2) | $ (16.1) |
Change in operating revenue, as a percent |  |  |  |  |  |  |  |  |  | (16.00%) | (8.00%)
International | Canada |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 149.6 | $ 154.4 | $ 146.7
Change in operating revenue |  |  |  |  |  |  |  |  | (4.8) | $ 7.7 |
Change in operating revenue, as a percent |  |  |  |  |  |  |  |  |  | (3.00%) | 5.00%
Global Consumer Solutions |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 345.0 | $ 359.9 | $ 371.8
Change in operating revenue |  |  |  |  |  |  |  |  | $ (14.9) | $ (11.9) |
Change in operating revenue, as a percent |  |  |  |  |  |  |  |  |  | (4.00%) | (3.00%)

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