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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, 2017
Dec. 31, 2016
Assets    
Cash and cash equivalents $ 27.2 $ 14.6
Restricted cash and cash equivalents 313.9 224.7
Restricted securities available for sale [1] 46.5 45.3
Loans receivable, net 4,361.0 3,955.9
Liabilities    
Secured financing 2,489.3 2,072.0
Senior notes 567.1 560.5
Carrying Amount [Member]    
Assets    
Cash and cash equivalents 27.2 14.6
Restricted cash and cash equivalents 313.9 224.7
Restricted securities available for sale 46.5 45.3
Loans receivable, net 4,283.6 3,886.6
Liabilities    
Secured financing [1] 2,472.3 2,062.4
Senior notes [1] 542.1 541.3
Estimated Fair Value [Member]    
Assets    
Cash and cash equivalents 27.2 14.6
Restricted cash and cash equivalents 313.9 224.7
Restricted securities available for sale 46.5 45.3
Loans receivable, net 4,361.0 3,955.9
Liabilities    
Secured financing [1] 2,489.3 2,072.0
Senior notes [1] $ 567.1 $ 560.5
[1] Measured and recorded at fair value on a recurring basis.