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, 2020	Dec. 31, 2019
Carrying Amount [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents		$ 16.0	$ 187.4
Restricted cash and cash equivalents		380.2	330.3
Restricted securities available for sale		66.1	59.3
Net investment in Loans receivable		6,787.9	6,685.2
Liabilities, Fair Value Disclosure [Abstract]
Revolving secured line of credit		95.9	0.0
Secured financing		3,711.6	3,339.7
Senior notes		790.6	1,187.8
Other Borrowings		10.5	11.3
Estimated Fair Value [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents		16.0	187.4
Restricted cash and cash equivalents		380.2	330.3
Restricted securities available for sale		66.1	59.3
Net investment in Loans receivable		7,216.4	6,777.2
Liabilities, Fair Value Disclosure [Abstract]
Revolving secured line of credit		95.9	0.0
Secured financing		3,793.9	3,397.5
Senior notes		842.0	1,257.6
Other Borrowings		10.5	11.3
Cash and cash equivalents	[1]	16.0	187.4
Restricted cash and cash equivalents	[1]	380.2	330.3
Restricted securities available for sale	[2]	66.1	59.3
Net investment in Loans receivable	[1]	7,216.4	6,777.2
Revolving secured line of credit	[1]	95.9	0.0
Secured financing	[1]	3,793.9	3,397.5
Senior notes	[1]	842.0	1,257.6
Other Borrowings	[1]	$ 10.5	$ 11.3

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

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