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Other Assets (Capital Contributions Made to Loan Origination Partners) (Details) - Loan Originators $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($)
Other Assets [Line Items]
Equity method investments	$ 28.5
Equity investment, convertible notes	75.0
Impairment on investment	58.1
Company’s residential whole loans at carrying value are serviced by entities the Company has an investment in	2,000.0
Preferred Stock
Other Assets [Line Items]
Equity method investments	$ 69.4

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