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REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 876.9 | $ 856.7 | $ 1,742.6 | $ 1,689.0
Change in revenue | $ 20.2 |  | $ 53.6 |
Operating revenue | 2.00% |  | 3.00% |
Operating Segments | U.S. Information Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 324.6 | 331.9 | $ 631.5 | 642.0
Change in revenue | $ (7.3) |  | $ (10.5) |
Operating revenue | (2.00%) |  | (2.00%) |
Operating Segments | U.S. Information Solutions | Online Information Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 224.1 | 232.6 | $ 443.8 | 457.7
Change in revenue | $ (8.5) |  | $ (13.9) |
Operating revenue | (4.00%) |  | (3.00%) |
Operating Segments | U.S. Information Solutions | Mortgage Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 45.5 | 38.6 | $ 87.2 | 77.3
Change in revenue | $ 6.9 |  | $ 9.9 |
Operating revenue | 18.00% |  | 13.00% |
Operating Segments | U.S. Information Solutions | Financial Marketing Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 55.0 | 60.7 | $ 100.5 | 107.0
Change in revenue | $ (5.7) |  | $ (6.5) |
Operating revenue | (9.00%) |  | (6.00%) |
Operating Segments | International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 250.3 | 231.4 | $ 494.8 | 447.7
Change in revenue | $ 18.9 |  | $ 47.1 |
Operating revenue | 8.00% |  | 11.00% |
Operating Segments | International | Asia Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 86.1 | 76.5 | $ 168.5 | 148.5
Change in revenue | $ 9.6 |  | $ 20.0 |
Operating revenue | 12.00% |  | 13.00% |
Operating Segments | International | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 72.3 | 68.5 | $ 143.0 | 130.2
Change in revenue | $ 3.8 |  | $ 12.8 |
Operating revenue | 6.00% |  | 10.00% |
Operating Segments | International | Latin America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 54.2 | 52.9 | $ 110.1 | 104.0
Change in revenue | $ 1.3 |  | $ 6.1 |
Operating revenue | 2.00% |  | 6.00% |
Operating Segments | International | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 37.7 | 33.5 | $ 73.2 | 65.0
Change in revenue | $ 4.2 |  | $ 8.2 |
Operating revenue | 13.00% |  | 13.00% |
Operating Segments | Workforce Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 207.6 | 194.5 | $ 418.7 | 394.5
Change in revenue | $ 13.1 |  | $ 24.2 |
Operating revenue | 7.00% |  | 6.00% |
Operating Segments | Workforce Solutions | Verification Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 149.3 | 130.3 | $ 277.7 | 245.4
Change in revenue | $ 19.0 |  | $ 32.3 |
Operating revenue | 15.00% |  | 13.00% |
Operating Segments | Workforce Solutions | Employer Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 58.3 | 64.2 | $ 141.0 | 149.1
Change in revenue | $ (5.9) |  | $ (8.1) |
Operating revenue | (9.00%) |  | (5.00%) |
Operating Segments | Global Consumer Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenue | $ 94.4 | $ 98.9 | $ 197.6 | $ 204.8
Change in revenue | $ (4.5) |  | $ (7.2) |
Operating revenue | (5.00%) |  | (4.00%) |

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