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 | ||