General form of registration statement for all companies including face-amount certificate companies

Nature of business and summary of significant accounting policies - Allowance for Doubtful Accounts (Q3) (Details)

v3.20.4
Nature of business and summary of significant accounting policies - Allowance for Doubtful Accounts (Q3) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Nature of business and summary of significant accounting policies [Abstract]      
Allowance for doubtful accounts (less than) $ 0.1 $ 0.1 $ 0.0