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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, 2017
Dec. 31, 2016
Assets    
Cash and cash equivalents $ 11.1 $ 14.6
Restricted cash and cash equivalents 316.7 224.7
Restricted securities available for sale [1] 46.7 45.3
Loans receivable, net 4,208.5 3,955.9
Liabilities    
Revolving secured line of credit 134.1  
Secured financing 2,246.3 2,072.0
Senior notes 552.5 560.5
Carrying Amount [Member]    
Assets    
Cash and cash equivalents 11.1 14.6
Restricted cash and cash equivalents 316.7 224.7
Restricted securities available for sale 46.7 45.3
Loans receivable, net 4,136.0 3,886.6
Liabilities    
Revolving secured line of credit 134.1 0.0
Secured financing [1] 2,229.5 2,062.4
Senior notes [1] 541.7 541.3
Estimated Fair Value [Member]    
Assets    
Cash and cash equivalents 11.1 14.6
Restricted cash and cash equivalents 316.7 224.7
Restricted securities available for sale 46.7 45.3
Loans receivable, net 4,208.5 3,955.9
Liabilities    
Revolving secured line of credit 134.1 0.0
Secured financing [1] 2,246.3 2,072.0
Senior notes [1] $ 552.5 $ 560.5
[1] Measured and recorded at fair value on a recurring basis.