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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 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) $ 4.7   $ 4.7   $ 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) 4.7 $ 1.4 4.7 $ 1.4 $ 108.4
Level 3 | Silverton 2015          
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance   107.6   190.6  
Distributed to third party   (1.6)   (89.0)  
Total change in fair value included in the statement of operations   (0.5)   3.9  
Ending balance   $ 105.5   $ 105.5  
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 (2.9)   (114.1)    
Total change in fair value included in the statement of operations 3.3   6.2    
Ending balance $ 115.5   $ 115.5