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SEGMENT INFORMATION (Operating Revenue and Operating Income by Operating Segment) (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) segment | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue | $ 804.1 | $ 667.4 | $ 2,343.8 | $ 1,997.3 |
Operating income | 212.1 | 174.3 | 614.0 | 517.0 |
Total assets | 6,806.6 |  | $ 6,806.6 |  | $ 4,501.5
Number of reporting segments | segment |  |  | 4 |  |
Number of operating segments | segment |  |  | 4 |  |
General Corporate Expense |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income | (51.6) | (46.8) | $ (169.2) | (173.6) |
Total assets | 376.8 |  | 376.8 |  | 321.0
U.S. Information Solutions | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue | 317.4 | 292.5 | 920.2 | 875.1 |
Operating income | 139.5 | 117.0 | 396.3 | 368.1 |
Total assets | 1,842.7 |  | 1,842.7 |  | 1,869.6
International | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue | 214.3 | 145.4 | 591.2 | 425.9 |
Operating income | 26.3 | 28.5 | 79.3 | 84.0 |
Total assets | 3,053.0 |  | 3,053.0 |  | 844.5
Workforce Solutions | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue | 171.3 | 139.0 | 528.7 | 434.0 |
Operating income | 69.9 | 50.0 | 226.9 | 165.9 |
Total assets | 1,345.2 |  | 1,345.2 |  | 1,268.5
Global Consumer Solutions | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue | 101.1 | 90.5 | 303.7 | 262.3 |
Operating income | 28.0 | $ 25.6 | 80.7 | $ 72.6 |
Total assets | $ 188.9 |  | $ 188.9 |  | $ 197.9

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