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Fair Value Measurements - Reconciliation of Liabilities Using Level 3 Inputs (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Accrued expenses (current liabilities) $ 9.5 $ 4.9  
Fair Value, Measurements, Recurring      
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) (7.6)   $ (42.4)
Level 3 | Fair Value, Measurements, Recurring      
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) (7.6)   $ (42.4)
Level 3 | Fair Value, Measurements, Recurring | 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  
Level 3 | Fair Value, Measurements, Recurring | Silverton 2017      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 86.6    
Distributed to third party (45.8)    
Total change in fair value included in the statement of operations (1.0)    
Ending balance 39.8    
Third party      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Accrued expenses (current liabilities) $ 7.6 $ 4.9