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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Segment Reporting Information [Line Items] |  |  |  |
Operating revenue | $ 982.8 | $ 880.0 | $ 1,940.8 | $ 1,726.1
Operating income | 166.8 | 113.8 | 302.7 | (504.0)
General Corporate Expense |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income | (122.1) | (135.2) | (255.7) | (968.0)
U.S. Information Solutions | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenue | 365.6 | 332.7 | 708.8 | 631.0
Operating income | 113.1 | 117.9 | 220.7 | 214.0
Workforce Solutions | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenue | 352.9 | 230.1 | 654.6 | 458.6
Operating income | 174.2 | 95.6 | 307.7 | 191.8
International | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenue | 180.5 | 229.0 | 396.5 | 454.1
Operating income | (6.2) | 22.7 | 9.1 | 33.9
Global Consumer Solutions | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenue | 83.8 | 88.2 | 180.9 | 182.4
Operating income | $ 7.8 | $ 12.8 | $ 20.9 | $ 24.3

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