Fair Value of Financial Instruments (Schedule of Assets and Liabilities, Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 1.3	$ 6.4
Restricted cash and cash equivalents	177.5	157.6
Restricted securities available for sale	52.1	53.2
Net investment in Loans receivable	2,844.3	2,517.3
Revolving secured line of credit	24.8	119.5
Secured financing	1,346.8	1,334.7
Senior notes	562.6	299.3
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	1.3	6.4
Restricted cash and cash equivalents	177.5	157.6
Restricted securities available for sale	41.7	47.8
Senior notes	562.6	299.3
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted securities available for sale	10.4	5.4
Revolving secured line of credit	24.8	119.5
Secured financing	1,346.8	1,334.7
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net investment in Loans receivable	$ 2,844.3	$ 2,517.3