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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, 2017 | Dec. 31, 2016
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents |  | $ 4.9 | $ 14.6
Restricted cash and cash equivalents |  | 273.6 | 224.7
Restricted securities available for sale | [1] | 46.1 | 45.3
Loans receivable, net |  | 4,536.9 | 3,955.9
Revolving secured line of credit |  | 130.5 | 0.0
Secured financing |  | 2,348.5 | 2,072.0
Senior notes |  | 569.0 | 560.5
Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents |  | 4.9 | 14.6
Restricted cash and cash equivalents |  | 273.6 | 224.7
Restricted securities available for sale | [1] | 36.9 | 37.1
Revolving secured line of credit |  | 130.5 |
Senior notes |  | 569.0 | 560.5
Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Restricted securities available for sale | [1] | 9.2 | 8.2
Revolving secured line of credit |  | 0.0 | 0.0
Secured financing |  | 2,348.5 | 2,072.0
Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans receivable, net |  | $ 4,536.9 | $ 3,955.9
[1] | Measured and recorded at fair value on a recurring basis.

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