SEGMENT INFORMATION - Operating Revenue and Operating Income by Operating Segment (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2020 |
Mar. 31, 2019 |
|
| Segment Reporting Information [Line Items] | ||
| Operating revenue | $ 957.9 | $ 846.1 |
| Operating income | 135.9 | (617.9) |
| General Corporate Expense | ||
| Segment Reporting Information [Line Items] | ||
| Operating income | (133.6) | (832.7) |
| U.S. Information Solutions | Operating Segments | ||
| Segment Reporting Information [Line Items] | ||
| Operating revenue | 343.2 | 298.3 |
| Operating income | 107.6 | 96.0 |
| Workforce Solutions | Operating Segments | ||
| Segment Reporting Information [Line Items] | ||
| Operating revenue | 301.6 | 228.5 |
| Operating income | 133.5 | 11.2 |
| International | Operating Segments | ||
| Segment Reporting Information [Line Items] | ||
| Operating revenue | 216.0 | 225.1 |
| Operating income | 15.3 | 96.2 |
| Global Consumer Solutions | Operating Segments | ||
| Segment Reporting Information [Line Items] | ||
| Operating revenue | 97.1 | 94.2 |
| Operating income | $ 13.1 | $ 11.4 |