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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