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Fair Value of Financial Instruments (Schedule of Comparison of the Carrying Value and Estimated Fair Value of Financial Instruments) (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Assets |  |  |
Cash and cash equivalents | [1] | $ 19.7 | $ 25.7
Restricted cash and cash equivalents | [1] | 328.8 | 303.6
Restricted securities available for sale | [2] | 61.5 | 58.6
Loans receivable, net | [1] | 6,466.8 | 5,855.1
Liabilities |  |  |
Revolving secured line of credit | [1] | 38.4 | 171.9
Secured financing | [1] | 3,275.6 | 3,100.9
Senior notes | [1] | 985.2 | 556.3
Mortgage note | [1] | 11.6 | 11.9
Carrying Amount [Member] |  |  |
Assets |  |  |
Cash and cash equivalents |  | 19.7 | 25.7
Restricted cash and cash equivalents |  | 328.8 | 303.6
Restricted securities available for sale |  | 61.5 | 58.6
Loans receivable, net |  | 6,384.0 | 5,763.3
Liabilities |  |  |
Revolving secured line of credit |  | 38.4 | 171.9
Secured financing |  | 3,233.0 | 3,092.7
Senior notes |  | 939.6 | 544.4
Mortgage note |  | 11.6 | 11.9
Estimated Fair Value [Member] |  |  |
Assets |  |  |
Cash and cash equivalents |  | 19.7 | 25.7
Restricted cash and cash equivalents |  | 328.8 | 303.6
Restricted securities available for sale |  | 61.5 | 58.6
Loans receivable, net |  | 6,466.8 | 5,855.1
Liabilities |  |  |
Revolving secured line of credit |  | 38.4 | 171.9
Secured financing |  | 3,275.6 | 3,100.9
Senior notes |  | 985.2 | 556.3
Mortgage note |  | $ 11.6 | $ 11.9
[1] | Measured at amortized cost with fair value disclosed.
[2] | Measured at fair value on a recurring basis.

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