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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Summary of Financial Effects of Borrowers Experiencing Financial Difficulty (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Large Loans [Member] | Interest Rate Reduction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reduced weighted-average contractual interest	17.80%	15.00%	18.20%	11.20%
Large Loans [Member] | Term Extension [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Added weighted-average period to loans	1 year 2 months 12 days	1 year 2 months 12 days	1 year 4 months 24 days	1 year 4 months 24 days
Large Loans [Member] | Principal Forgiveness [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reduced amortized cost basis	$ 0.3	$ 0.3	$ 0.9	$ 0.9
Small Loans [Member] | Interest Rate Reduction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reduced weighted-average contractual interest	28.60%	26.80%	29.30%	22.60%
Small Loans [Member] | Term Extension [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Added weighted-average period to loans	1 year	1 year 1 month 6 days	1 year 3 months 18 days	1 year 3 months 18 days
Small Loans [Member] | Principal Forgiveness [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reduced amortized cost basis	$ 0.1	$ 0.1	$ 0.3	$ 0.3

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481628/310-20-40-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

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