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Variable Interest Entities - Summary of Silverton Loan Notes (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Movement in Silverton Loan Notes [Roll Forward]        
Total liability balance of Loan Notes, Beginning Balance $ 107.2 $ 277.9    
Total change in fair value for the period 1.0 (2.9)    
Total distributed in the period (56.5) (139.5)    
Total liability balance of Loan Notes, Ending Balance 49.4 142.0    
Loan notes (long-term liabilities)     $ 39.9 $ 137.1
Accrued expenses (current liabilities)     9.5 4.9
Total aggregate unpaid balance 107.2 277.9 49.4 142.0
Third party        
Movement in Silverton Loan Notes [Roll Forward]        
Total liability balance of Loan Notes, Beginning Balance 86.6 223.4    
Total change in fair value for the period (1.0) 2.9    
Total distributed in the period (45.8) (111.2)    
Total liability balance of Loan Notes, Ending Balance 39.8 115.1    
Loan notes (long-term liabilities)     32.2 110.2
Accrued expenses (current liabilities)     7.6 4.9
Total aggregate unpaid balance 86.6 223.4 39.8 115.1
Aspen Holdings        
Movement in Silverton Loan Notes [Roll Forward]        
Total liability balance of Loan Notes, Beginning Balance 20.6 54.5    
Total change in fair value for the period (0.3) 0.7    
Total distributed in the period (10.7) (28.3)    
Total liability balance of Loan Notes, Ending Balance 9.6 26.9    
Loan notes (long-term liabilities)     7.7 26.9
Accrued expenses (current liabilities)     1.9 0.0
Total aggregate unpaid balance 20.6 54.5 $ 9.6 $ 26.9
Aspen Holdings | Third party        
Movement in Silverton Loan Notes [Roll Forward]        
Total change in fair value for the period $ (1.3) $ 3.6