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SEGMENT INFORMATION (Operating Revenue and Operating Income by Operating Segment) (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) segment | Jun. 30, 2015 USD ($) | Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue: | $ 811.3 | $ 678.1 | $ 1,539.6 | $ 1,329.9 |
Operating income: | 225.7 | 188.5 | 401.9 | 342.7 |
Total assets: | 6,640.8 |  | $ 6,640.8 |  | $ 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: | (46.1) | (48.5) | $ (117.6) | (126.9) |
Total assets: | 364.2 |  | 364.2 |  | 321.0
U.S. Information Solutions | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue: | 307.9 | 298.2 | 602.8 | 582.7 |
Operating income: | 134.0 | 128.0 | 256.8 | 251.1 |
Total assets: | 1,846.0 |  | 1,846.0 |  | 1,869.6
International | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue: | 218.8 | 145.1 | 376.9 | 280.5 |
Operating income: | 33.7 | 28.5 | 53.0 | 55.6 |
Total assets: | 2,958.8 |  | 2,958.8 |  | 844.5
Workforce Solutions | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue: | 177.3 | 146.3 | 357.4 | 295.0 |
Operating income: | 78.3 | 56.0 | 156.9 | 116.0 |
Total assets: | 1,275.0 |  | 1,275.0 |  | 1,268.5
Global Consumer Solutions | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue: | 107.3 | 88.5 | 202.5 | 171.7 |
Operating income: | 25.8 | $ 24.5 | 52.8 | $ 46.9 |
Total assets: | $ 196.8 |  | $ 196.8 |  | $ 197.9

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