OTHER FINANCIAL INFORMATION - Items reported in accrued expenses (Details) - USD ($) $ in Millions |
Sep. 30, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|---|---|---|---|
| OTHER FINANCIAL INFORMATION | |||
| Deferred revenue | $ 160.9 | $ 170.5 | |
| Accrued payroll and other employee compensation | 145.4 | 133.6 | |
| Product warranty | $ 33.1 | 43.2 | 44.9 |
| Estimated Litigation Liability, Current | 96.6 | 92.9 | 60.0 |
| Lease Incentive, Payable, Current | 425.3 | 395.3 | |
| Accrued Liabilities, Current | $ 876.8 | $ 867.7 | $ 804.3 |