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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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 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) $ (2.4)   $ (2.4)   $ (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) (2.4) $ (2.3) (2.4) $ (2.3) $ (108.4)
Level 3 | Silverton 2015          
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance   105.5   190.6  
Distributed to third party   (0.3)   (89.3)  
Total change in fair value included in the statement of operations   9.8   13.7  
Ending balance   $ 115.0   $ 115.0  
Level 3 | Silverton 2016          
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance 115.1   223.4    
Distributed to third party (1.4)   (115.9)    
Total change in fair value included in the statement of operations (9.8)   (3.6)    
Ending balance $ 103.9   $ 103.9