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Variable Interest Entities - Summary of Silverton Loan Notes (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Movement in Silverton Loan Notes [Roll Forward]            
Total liability balance of Loan Notes, Beginning Balance     $ 277.9 $ 235.0    
Total change in fair value for the period $ 9.8 $ (9.8) 3.6 (13.7)    
Total distributed in the period     (144.7) (108.7)    
Total liability balance of Loan Notes, Ending Balance 128.7 143.4 128.7 143.4    
Loan notes (long-term liabilities)         $ 125.7 $ 140.6
Accrued expenses (current liabilities)         3.0 2.8
Total aggregate unpaid balance 128.7 143.4 277.9 235.0 128.7 143.4
Third party            
Movement in Silverton Loan Notes [Roll Forward]            
Total liability balance of Loan Notes, Beginning Balance     223.4 190.6    
Total change in fair value for the period     (3.6) 13.7    
Total distributed in the period     (115.9) (89.3)    
Total liability balance of Loan Notes, Ending Balance 103.9 115.0 103.9 115.0    
Loan notes (long-term liabilities)         101.5 112.7
Accrued expenses (current liabilities)         2.4 2.3
Total aggregate unpaid balance 103.9 115.0 223.4 190.6 103.9 115.0
Aspen Holdings            
Movement in Silverton Loan Notes [Roll Forward]            
Total liability balance of Loan Notes, Beginning Balance     54.5 44.4    
Total change in fair value for the period     (0.9) 3.4    
Total distributed in the period     (28.8) (19.4)    
Total liability balance of Loan Notes, Ending Balance 24.8 28.4 24.8 28.4    
Loan notes (long-term liabilities)         24.2 27.9
Accrued expenses (current liabilities)         0.6 0.5
Total aggregate unpaid balance $ 24.8 $ 28.4 54.5 44.4 $ 24.8 $ 28.4
Aspen Holdings | Third party            
Movement in Silverton Loan Notes [Roll Forward]            
Total change in fair value for the period     $ (4.5) $ 17.1