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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
Mar. 31, 2019
Dec. 31, 2018
Assets    
Cash and cash equivalents [1] $ 41.3 $ 25.7
Restricted cash and cash equivalents [1] 417.9 303.6
Restricted securities available for sale [2] 62.0 58.6
Loans receivable, net [1] 6,229.5 5,855.1
Liabilities    
Revolving secured line of credit [1] 0.0 171.9
Secured financing [1] 3,306.3 3,100.9
Senior notes [1] 965.1 556.3
Mortgage note [1] 11.7 11.9
Carrying Amount [Member]    
Assets    
Cash and cash equivalents 41.3 25.7
Restricted cash and cash equivalents 417.9 303.6
Restricted securities available for sale 62.0 58.6
Loans receivable, net 6,143.7 5,763.3
Liabilities    
Revolving secured line of credit 0.0 171.9
Secured financing 3,280.5 3,092.7
Senior notes 939.1 544.4
Mortgage note 11.7 11.9
Estimated Fair Value [Member]    
Assets    
Cash and cash equivalents 41.3 25.7
Restricted cash and cash equivalents 417.9 303.6
Restricted securities available for sale 62.0 58.6
Loans receivable, net 6,229.5 5,855.1
Liabilities    
Revolving secured line of credit 0.0 171.9
Secured financing 3,306.3 3,100.9
Senior notes 965.1 556.3
Mortgage note $ 11.7 $ 11.9
[1] Measured at amortized cost with fair value disclosed.
[2] Measured at fair value on a recurring basis.