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REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 846.1 | $ 865.7
Change in revenue | $ (19.6) |
Operating revenue | (2.00%) |
Operating Segments | U.S. Information Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 298.3 | 306.9
Change in revenue | $ (8.6) |
Operating revenue | (3.00%) |
Operating Segments | U.S. Information Solutions | Online Information Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 217.7 | 219.7
Change in revenue | $ (2.0) |
Operating revenue | (1.00%) |
Operating Segments | U.S. Information Solutions | Mortgage Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 32.2 | 41.7
Change in revenue | $ (9.5) |
Operating revenue | (23.00%) |
Operating Segments | U.S. Information Solutions | Financial Marketing Services |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 48.4 | 45.5
Change in revenue | $ 2.9 |
Operating revenue | 6.00% |
Operating Segments | International |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 225.1 | 244.5
Change in revenue | $ (19.4) |
Operating revenue | (8.00%) |
Operating Segments | International | Asia Pacific |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 73.1 | 82.4
Change in revenue | $ (9.3) |
Operating revenue | (11.00%) |
Operating Segments | International | Europe |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 68.5 | 70.6
Change in revenue | $ (2.1) |
Operating revenue | (3.00%) |
Operating Segments | International | Latin America |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 47.2 | 56.0
Change in revenue | $ (8.8) |
Operating revenue | (16.00%) |
Operating Segments | International | Canada |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 36.3 | 35.5
Change in revenue | $ 0.8 |
Operating revenue | 2.00% |
Operating Segments | Workforce Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 228.5 | 211.1
Change in revenue | $ 17.4 |
Operating revenue | 8.00% |
Operating Segments | Workforce Solutions | Verification Services |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 148.9 | 128.4
Change in revenue | $ 20.5 |
Operating revenue | 16.00% |
Operating Segments | Workforce Solutions | Employer Services |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 79.6 | 82.7
Change in revenue | $ (3.1) |
Operating revenue | (4.00%) |
Operating Segments | Global Consumer Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 94.2 | $ 103.2
Change in revenue | $ (9.0) |
Operating revenue | (9.00%) |

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