Subsequent Events (Details) - USD ($) $ in Millions		1 Months Ended
	Apr. 15, 2021	Mar. 31, 2021
Subsequent Event
Liquidation of Agency RMBS portfolio		$ 1,400.0
Extinguishment of indebtedness on the RMDS portfolio		$ 1,300.0
Subsequent event
Subsequent Event
Liquidation of Agency RMBS portfolio	$ 387.4
Extinguishment of indebtedness on the RMDS portfolio	$ 349.5