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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
Jun. 30, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
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
Secured financing 2,489.3 2,072.0
Senior notes 567.1 560.5
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 27.2 14.6
Restricted cash and cash equivalents 313.9 224.7
Restricted securities available for sale [1] 37.5 37.1
Senior notes 567.1 560.5
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Restricted securities available for sale [1] 9.0 8.2
Secured financing 2,489.3 2,072.0
Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans receivable, net $ 4,361.0 $ 3,955.9
[1] Measured and recorded at fair value on a recurring basis.