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Other Assets (Capital Contributions Made to Loan Origination Partners) (Details) - Loan Originators - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Other Assets [Line Items]
Equity method investments	$ 49,700,000		$ 49,700,000
Impairment on investment	0	$ 7,100,000	0	$ 65,200,000
Company’s residential whole loans at carrying value are serviced by entities the Company has an investment in	704,000,000.0		704,000,000.0
Preferred Stock
Other Assets [Line Items]
Equity method investments	$ 100,400,000		$ 100,400,000

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