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Fair Value of Financial Instruments (Schedule of Assets and Liabilities, Measured at Fair Value on a Recurring Basis) - USD ($) $ in Millions | Sep. 30, 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] | $ 8.9 | $ 187.4
Restricted cash and cash equivalents | [1] | 391.9 | 330.3
Restricted securities available for sale | [2] | 66.8 | 59.3
Loans receivable, net | [1] | 7,263.0 | 6,777.2
Revolving secured line of credit | [1] | 125.7 | 0.0
Secured financing | [1] | 3,762.0 | 3,397.5
Senior notes | [1] | 808.1 | 1,257.6
Mortgage note | [1] | 10.7 | 11.3
Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents | [1] | 8.9 | 187.4
Restricted cash and cash equivalents | [1] | 391.9 | 330.3
Restricted securities available for sale | [2] | 53.8 | 47.5
Senior notes | [1] | 808.1 | 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] | 13.0 | 11.8
Revolving secured line of credit | [1] | 125.7 | 0.0
Secured financing | [1] | 3,762.0 | 3,397.5
Mortgage note | [1] | 10.7 | 11.3
Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans receivable, net | [1] | $ 7,263.0 | $ 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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