SEGMENT INFORMATION - Total Assets (Details) - USD ($) $ in Millions |
Sep. 30, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|---|---|---|---|
| Segment Reporting Information [Line Items] | |||
| Total assets | $ 4,771.7 | $ 4,657.4 | $ 4,794.4 |
| Corporate and other | |||
| Segment Reporting Information [Line Items] | |||
| Total assets | 261.3 | 238.5 | |
| Operating segment | |||
| Segment Reporting Information [Line Items] | |||
| Total assets | $ 4,413.6 | 4,396.1 | 4,555.9 |
| Operating segment | Americas | |||
| Segment Reporting Information [Line Items] | |||
| Total assets | 2,296.4 | 2,410.1 | |
| Operating segment | Asia Pacific | |||
| Segment Reporting Information [Line Items] | |||
| Total assets | 1,152.2 | 1,165.5 | |
| Operating segment | Europe, Middle East, & Africa | |||
| Segment Reporting Information [Line Items] | |||
| Total assets | $ 947.5 | $ 980.3 |