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SEGMENT INFORMATION - Operating Revenue and Operating Income by Operating Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Operating revenue | $ 876.9 | $ 856.7 | $ 1,742.6 | $ 1,689.0
Operating income | 193.6 | 265.9 | 337.8 | 484.5
General Corporate Expense |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income | (72.6) | (46.3) | (196.1) | (107.4)
U.S. Information Solutions | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenue | 324.6 | 331.9 | 631.5 | 642.0
Operating income | 126.3 | 149.7 | 237.2 | 279.4
International | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenue | 250.3 | 231.4 | 494.8 | 447.7
Operating income | 37.0 | 46.1 | 73.7 | 75.9
Workforce Solutions | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenue | 207.6 | 194.5 | 418.7 | 394.5
Operating income | 83.9 | 89.0 | 173.9 | 178.4
Global Consumer Solutions | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenue | 94.4 | 98.9 | 197.6 | 204.8
Operating income | $ 19.0 | $ 27.4 | $ 49.1 | $ 58.2

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