Subsequent Events (Details) - Convertible Promissory Notes - USD ($) $ in Millions	Jul. 30, 2021	Mar. 09, 2021	Jul. 30, 2020	Oct. 11, 2019	Jul. 19, 2019
Subsequent Event [Line Items]
Investment owned, at cost		$ 25.0	$ 25.0	$ 25.0	$ 30.0
Subsequent Event
Subsequent Event [Line Items]
Investment owned, at cost	$ 30.0
Investment owned, fair value, including accrued interest	$ 39.7