Fair Value Of Financial Instruments (Schedule Of Assets And Liabilities, Measured At Fair Value) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 14.6	$ 6.3
Restricted cash and cash equivalents	224.7	167.4
Restricted securities available for sale	45.3	48.3
Net investment in Loans receivable	3,955.9	3,126.3
Revolving secured line of credit	0.0	57.7
Secured financing	2,072.0	1,471.9
Senior notes	560.5	549.6
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	14.6	6.3
Restricted cash and cash equivalents	224.7	167.4
Restricted securities available for sale	37.1	38.7
Net investment in Loans receivable	0.0	0.0
Revolving secured line of credit	0.0	0.0
Secured financing	0.0	0.0
Senior notes	560.5	549.6
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0.0	0.0
Restricted cash and cash equivalents	0.0	0.0
Restricted securities available for sale	8.2	9.6
Net investment in Loans receivable	0.0	0.0
Revolving secured line of credit	0.0	57.7
Secured financing	2,072.0	1,471.9
Senior notes	0.0	0.0
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0.0	0.0
Restricted cash and cash equivalents	0.0	0.0
Restricted securities available for sale	0.0	0.0
Net investment in Loans receivable	3,955.9	3,126.3
Revolving secured line of credit	0.0	0.0
Secured financing	0.0	0.0
Senior notes	$ 0.0	$ 0.0