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SEGMENT INFORMATION (Operating Revenue and Operating Income by Operating Segment) (Detail) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) segment | Jun. 30, 2014 USD ($) | Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue | $ 678.1 | $ 613.9 | $ 1,329.9 | $ 1,198.4 |
Operating income | 188.5 | 167.4 | 342.7 | 319.3 |
Total assets | 4,585.5 |  | $ 4,585.5 |  | $ 4,674.2
Number of reportable segments | segment |  |  | 4 |  |
U.S. Information Solutions |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue | 315.7 | 281.1 | $ 614.4 | 542.3 |
Operating income | 132.8 | 111.1 | 259.4 | 208.1 |
Total assets | 1,962.3 |  | 1,962.3 |  | 1,983.9
International |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue | 148.4 | 150.0 | 287.2 | 290.8 |
Operating income | 29.5 | 32.8 | 57.5 | 61.8 |
Total assets | 906.2 |  | 906.2 |  | 983.7
Workforce Solutions |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue | 146.3 | 119.4 | 295.0 | 239.1 |
Operating income | 56.0 | 40.5 | 116.0 | 79.2 |
Total assets | 1,272.3 |  | 1,272.3 |  | 1,271.3
Personal Solutions |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue | 67.7 | 63.4 | 133.3 | 126.2 |
Operating income | 18.7 | 19.6 | 36.7 | 37.5 |
Total assets | 122.3 |  | 122.3 |  | 123.8
General Corporate |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income | (48.5) | $ (36.6) | (126.9) | $ (67.3) |
Total assets | $ 322.4 |  | $ 322.4 |  | $ 311.5

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