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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 | Mar. 31, 2020 | Dec. 31, 2019
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents | [1] | $ 25.7 | $ 187.4
Restricted cash and cash equivalents | [1] | 408.1 | 330.3
Restricted securities available for sale | [2] | 63.2 | 59.3
Loans receivable, net | [1] | 7,044.3 | 6,777.2
Revolving secured line of credit | [1] | 79.9 | 0.0
Secured financing | [1] | 3,915.7 | 3,397.5
Senior notes | [1] | 738.6 | 1,257.6
Mortgage note | [1] | 11.1 | 11.3
Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents | [1] | 25.7 | 187.4
Restricted cash and cash equivalents | [1] | 408.1 | 330.3
Restricted securities available for sale | [2] | 48.9 | 47.5
Senior notes | [1] | 738.6 | 1,257.6
Mortgage note | [1] | 0.0 | 0.0
Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Restricted securities available for sale | [2] | 14.3 | 11.8
Revolving secured line of credit | [1] | 79.9 | 0.0
Secured financing | [1] | 3,915.7 | 3,397.5
Mortgage note | [1] | 11.1 | 11.3
Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans receivable, net | [1] | $ 7,044.3 | $ 6,777.2
[1] | Measured at amortized cost with fair value disclosed.
[2] | Measured at fair value on a recurring basis.

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