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SEGMENT INFORMATION - Operating Revenue and Operating Income by Operating Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |
Operating revenue | $ 1,222.9 | $ 1,068.3 | $ 3,670.7 | $ 3,009.1
Operating income | 273.2 | 204.4 | 885.8 | 507.2
General Corporate Expense |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income | (136.3) | (155.3) | (402.5) | (410.8)
Workforce Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenue | 508.0 | 376.8 | 1,484.5 | 1,031.4
Workforce Solutions | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income | 253.1 | 193.2 | 783.0 | 500.8
U.S. Information Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenue | 387.8 | 386.3 | 1,203.0 | 1,095.1
U.S. Information Solutions | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income | 116.7 | 128.6 | 382.5 | 349.3
International |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenue | 245.4 | 218.0 | 737.7 | 614.6
International | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income | 27.9 | 25.4 | 85.1 | 34.5
Global Consumer Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenue | 81.7 | 87.2 | 245.5 | 268.0
Global Consumer Solutions | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income | $ 11.8 | $ 12.5 | $ 37.7 | $ 33.4

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