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Fair Value Measurements - Reconciliation of Liabilities Using Level 3 Inputs (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Loan notes issued by variable interest entities, at fair value (included within accrued expenses and other payables) $ 4.9   $ 108.4
Level 3      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Loan notes issued by variable interest entities, at fair value (included within accrued expenses and other payables) 4.9 $ 3.1 $ 108.4
Level 3 | Silverton 2015      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance   190.6  
Distributed to third party   (87.4)  
Total change in fair value included in the statement of operations   4.4  
Ending balance   $ 107.6  
Level 3 | Silverton 2016      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 223.4    
Distributed to third party (111.2)    
Total change in fair value included in the statement of operations 2.9    
Ending balance $ 115.1