Fair Value Of Financial Instruments (Schedule Of Assets And Liabilities, Measured At Fair Value) (Details) - USD ($) $ in Millions		Dec. 31, 2018		Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	[1]	$ 25.7		$ 8.2
Restricted cash and cash equivalents	[1]	303.6		255.6
Restricted securities available for sale	[2]	58.6		46.1
Net investment in Loans receivable	[1]	5,855.1		4,741.5
Revolving secured line of credit	[1]	171.9		13.9
Secured financing	[1]	3,100.9		2,527.6
Senior notes	[1]	556.3		569.4
Other Borrowings		11.9	[1]	0.0
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	[1]	25.7		8.2
Restricted cash and cash equivalents	[1]	303.6		255.6
Restricted securities available for sale	[2]	47.9		37.1
Net investment in Loans receivable	[1]	0.0		0.0
Revolving secured line of credit	[1]	0.0		0.0
Secured financing	[1]	0.0		0.0
Senior notes	[1]	556.3		569.4
Other Borrowings	[1]	0.0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	[1]	0.0		0.0
Restricted cash and cash equivalents	[1]	0.0		0.0
Restricted securities available for sale	[2]	10.7		9.0
Net investment in Loans receivable	[1]	0.0		0.0
Revolving secured line of credit	[1]	171.9		13.9
Secured financing	[1]	3,100.9		2,527.6
Senior notes	[1]	0.0		0.0
Other Borrowings	[1]	11.9
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	[1]	0.0		0.0
Restricted cash and cash equivalents	[1]	0.0		0.0
Restricted securities available for sale	[2]	0.0		0.0
Net investment in Loans receivable	[1]	5,855.1		4,741.5
Revolving secured line of credit	[1]	0.0		0.0
Secured financing	[1]	0.0		0.0
Senior notes	[1]	0.0		$ 0.0
Other Borrowings	[1]	$ 0.0

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

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