Auto Loans Receivable - Components Of Receivables, Net Of Allowances For Expected Credit Losses (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025	Dec. 31, 2024
Receivables [Abstract]
Total auto loans receivable	$ 2,444.7	$ 2,209.9
Accrued interest and fees	14.5	14.1
Deferred loan origination costs	13.5	11.8
Less: unearned discounts	(0.2)	(0.2)
Less: allowances for expected credit losses	(101.3)	(95.4)	$ (54.8)
Auto loans receivable, net	$ 2,371.2	$ 2,140.2