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Fair Value of Financial Instruments (Schedule of Assets and Liabilities, Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions | Sep. 30, 2015 | Dec. 31, 2014
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | $ 134.7 | $ 6.4
Restricted cash and cash equivalents | 176.0 | 157.6
Restricted securities available for sale | 50.5 | 53.2
Net investment in Loans receivable | 2,977.2 | 2,517.3
Revolving secured line of credit |  | 119.5
Secured financing | 1,532.6 | 1,334.7
Senior notes | 557.9 | 299.3
Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 134.7 | 6.4
Restricted cash and cash equivalents | 176.0 | 157.6
Restricted securities available for sale | 40.8 | 47.8
Senior notes | 557.9 | 299.3
Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Restricted securities available for sale | 9.7 | 5.4
Revolving secured line of credit |  | 119.5
Secured financing | 1,532.6 | 1,334.7
Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net investment in Loans receivable | $ 2,977.2 | $ 2,517.3

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