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Other Assets - Capital Contributions Made to Loan Origination Partners (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Other Assets [Line Items]
Equity method investments	$ 32.0		$ 32.0
Unrealized loss on loan originator investment	10.6
Loan Origination Partners
Other Assets [Line Items]
Impairment (reversal) on investment	28.6	$ 0.0	28.6	$ 0.0
Common Stock | Loan Origination Partners
Other Assets [Line Items]
Equity method investments	8.9		8.9
Preferred Stock | Loan Origination Partners
Other Assets [Line Items]
Equity method investments	$ 23.1		$ 23.1

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