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, 2015	Dec. 31, 2014
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	$ 6.3	$ 6.4
Restricted cash and cash equivalents	167.4	157.6
Restricted securities available for sale	48.3	53.2
Net investment in Loans receivable	3,126.3	2,517.3
Liabilities, Fair Value Disclosure [Abstract]
Revolving secured line of credit	57.7	119.5
Secured financing	1,471.9	1,334.7
Senior notes	549.6	299.3
Carrying Amount [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	6.3	6.4
Restricted cash and cash equivalents	167.4	157.6
Restricted securities available for sale	48.3	53.2
Net investment in Loans receivable	3,101.5	2,512.9
Liabilities, Fair Value Disclosure [Abstract]
Revolving secured line of credit	57.7	119.5
Secured financing	1,478.6	1,333.0
Senior notes	548.3	300.0
Estimated Fair Value [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	6.3	6.4
Restricted cash and cash equivalents	167.4	157.6
Restricted securities available for sale	48.3	53.2
Net investment in Loans receivable	3,126.3	2,517.3
Liabilities, Fair Value Disclosure [Abstract]
Revolving secured line of credit	57.7	119.5
Secured financing	1,471.9	1,334.7
Senior notes	$ 549.6	$ 299.3