Other Assets - Capital Contributions Made to Loan Origination Partners (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Other Assets [Line Items]
Equity method investments	$ 21.1		$ 21.1
Loan Origination Partners
Other Assets [Line Items]
Impairment on investment			0.0	$ 0.0
Net unrealized gain/(loss) on securities	0.0	$ 0.0	0.9	$ 3.4
Common Stock \| Loan Origination Partners
Other Assets [Line Items]
Equity method investments	6.0		6.0
Preferred Stock \| Loan Origination Partners
Other Assets [Line Items]
Equity method investments	$ 15.1		$ 15.1

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.