Fair Value Of Financial Instruments (Schedule Of Comparison Of The Carrying Value And Estimated Fair Value Of These Financial Instruments) (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
Carrying Amount [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents		$ 13.2	$ 7.7
Restricted cash and cash equivalents		457.7	410.0
Debt Securities, Available-for-sale, Restricted		93.2	72.3
Net investment in Loans receivable		6,955.3	6,297.7
Liabilities, Fair Value Disclosure [Abstract]
Revolving secured line of credit		79.2	30.9
Secured financing		3,990.9	3,756.4
Senior notes		989.0	794.5
Other Borrowings		8.4	8.9
Estimated Fair Value [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents		13.2	7.7
Restricted cash and cash equivalents		457.7	410.0
Debt Securities, Available-for-sale, Restricted		93.2	72.3
Net investment in Loans receivable		7,759.1	6,767.9
Liabilities, Fair Value Disclosure [Abstract]
Revolving secured line of credit		79.2	30.9
Secured financing		4,025.9	3,581.9
Senior notes		1,039.8	759.0
Other Borrowings		8.4	8.9
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

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

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