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Other Assets - Capital Contributions Made to Loan Origination Partners (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Other Assets [Line Items]
Equity method investments	$ 20.2		$ 20.2
Loan Origination Partners
Other Assets [Line Items]
Impairment on investment			0.0	$ 0.0
Net unrealized gain/(loss) on securities	0.0	$ (1.5)	3.4	$ (3.0)
Common Stock | Loan Origination Partners
Other Assets [Line Items]
Equity method investments	5.1		5.1
Preferred Stock | Loan Origination Partners
Other Assets [Line Items]
Equity method investments	$ 15.1		$ 15.1

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Amount of other-than-temporary decline in value that has been recognized against investment accounted for under equity method of accounting.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
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-Publisher FASB
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Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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