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SEGMENT INFORMATION - Operating Revenue and Operating Income by Operating Segment (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Segment Reporting Information [Line Items] |  |
Operating revenue | $ 957.9 | $ 846.1
Operating income | 135.9 | (617.9)
General Corporate Expense |  |
Segment Reporting Information [Line Items] |  |
Operating income | (133.6) | (832.7)
U.S. Information Solutions | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Operating revenue | 343.2 | 298.3
Operating income | 107.6 | 96.0
Workforce Solutions | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Operating revenue | 301.6 | 228.5
Operating income | 133.5 | 11.2
International | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Operating revenue | 216.0 | 225.1
Operating income | 15.3 | 96.2
Global Consumer Solutions | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Operating revenue | 97.1 | 94.2
Operating income | $ 13.1 | $ 11.4

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