Fair Value Of Financial Instruments (Schedule Of Assets And Liabilities, Measured At Fair Value) (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	[1]	$ 13.2	$ 7.7
Restricted cash and cash equivalents	[1]	457.7	410.0
Debt Securities, Available-for-sale, Restricted	[2]	93.2	72.3
Net investment in Loans receivable	[1]	7,759.1	6,767.9
Revolving secured line of credit	[1]	79.2	30.9
Secured financing	[1]	4,025.9	3,581.9
Senior notes	[1]	1,039.8	759.0
Other Borrowings	[1]	8.4	8.9
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	[1]	13.2	7.7
Restricted cash and cash equivalents	[1]	457.7	410.0
Debt Securities, Available-for-sale, Restricted	[2]	75.1	58.7
Net investment in Loans receivable	[1]	0.0	0.0
Revolving secured line of credit	[1]	0.0	0.0
Secured financing	[1]	3,225.8	2,781.8
Senior notes	[1]	1,039.8	759.0
Other Borrowings	[1]	0.0	0.0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	[1]	0.0	0.0
Restricted cash and cash equivalents	[1]	0.0	0.0
Debt Securities, Available-for-sale, Restricted	[2]	18.1	13.6
Net investment in Loans receivable	[1]	0.0	0.0
Revolving secured line of credit	[1]	79.2	30.9
Secured financing	[1]	800.1	800.1
Senior notes	[1]	0.0	0.0
Other Borrowings	[1]	8.4	8.9
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	[1]	0.0	0.0
Restricted cash and cash equivalents	[1]	0.0	0.0
Debt Securities, Available-for-sale, Restricted	[2]	0.0	0.0
Net investment in Loans receivable	[1]	7,759.1	6,767.9
Revolving secured line of credit	[1]	0.0	0.0
Secured financing	[1]	0.0	0.0
Senior notes	[1]	0.0	0.0
Other Borrowings	[1]	$ 0.0	$ 0.0

[1] Measured at amortized cost with fair value disclosed.

[2] Measured at fair value on a recurring basis.