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FAIR VALUE MEASUREMENT - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Mar. 31, 2016
Schedule of Equity Method Investments      
Assets measured at fair value on a nonrecurring basis $ 449.9 $ 292.4  
Reduction of value of assets due to fair value adjustment $ 28.7    
Consumer Loan Companies [Member]      
Schedule of Equity Method Investments      
Debt assumed     $ 1,803.2
Minimum [Member]      
Schedule of Equity Method Investments      
Recapture rate, term (in months) 3 months    
Broker price discount 10.00%    
Maximum [Member]      
Schedule of Equity Method Investments      
Recapture rate, term (in months) 6 months    
Broker price discount 25.00%    
Real Estate Securities [Member]      
Schedule of Equity Method Investments      
Assets measured at fair value on a nonrecurring basis $ 406.3 253.0  
Real Estate Acquired in Satisfaction of Debt [Member]      
Schedule of Equity Method Investments      
Assets measured at fair value on a nonrecurring basis 43.6 39.4  
Reduction of value of assets due to fair value adjustment 17.3 4.5  
Loans Held-for-sale [Member]      
Schedule of Equity Method Investments      
Reduction of value of assets due to fair value adjustment $ 11.4 $ 14.1  
Maturity Greater than 30 Days [Member]      
Schedule of Equity Method Investments      
Days delinquent (in days) 30 days    
MSRs [Member]      
Schedule of Equity Method Investments      
Discount rate 12.00%    
MSRs [Member] | Excess MSRs Investees [Member]      
Schedule of Equity Method Investments      
Weighted average discount rate, used to value investments in excess MSRs 9.80% 9.80%