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, 2019	Dec. 31, 2018
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	[1]	$ 187.4	$ 25.7
Restricted cash and cash equivalents	[1]	330.3	303.6
Restricted securities available for sale	[2]	59.3	58.6
Net investment in Loans receivable	[1]	6,777.2	5,855.1
Liabilities, Fair Value Disclosure [Abstract]
Revolving secured line of credit	[1]	0.0	171.9
Secured financing	[1]	3,397.5	3,100.9
Senior notes	[1]	1,257.6	556.3
Other Borrowings	[1]	11.3	11.9
Carrying Amount [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents		187.4	25.7
Restricted cash and cash equivalents		330.3	303.6
Restricted securities available for sale		59.3	58.6
Net investment in Loans receivable		6,685.2	5,763.3
Liabilities, Fair Value Disclosure [Abstract]
Revolving secured line of credit		0.0	171.9
Secured financing		3,339.7	3,092.7
Senior notes		1,187.8	544.4
Other Borrowings		11.3	11.9
Estimated Fair Value [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents		187.4	25.7
Restricted cash and cash equivalents		330.3	303.6
Restricted securities available for sale		59.3	58.6
Net investment in Loans receivable		6,777.2	5,855.1
Liabilities, Fair Value Disclosure [Abstract]
Revolving secured line of credit		0.0	171.9
Secured financing		3,397.5	3,100.9
Senior notes		1,257.6	556.3
Other Borrowings		$ 11.3	$ 11.9

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

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