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Variable Interest Entities - Summary of Silverton Loan Notes (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 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 $ (1.7) $ 9.8 (4.1) 3.6    
Total distributed in the period     (97.1) (144.7)    
Total liability balance of Loan Notes, Ending Balance 15.2 128.7 15.2 128.7    
Loan notes (long-term liabilities)         $ 0.0 $ 125.7
Accrued expenses (current liabilities)         15.2 3.0
Total aggregate unpaid balance 15.2 128.7 107.2 277.9 15.2 128.7
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     4.1 (3.6)    
Total distributed in the period     (78.4) (115.9)    
Total liability balance of Loan Notes, Ending Balance 12.3 103.9 12.3 103.9    
Loan notes (long-term liabilities)         0.0 101.5
Accrued expenses (current liabilities)         12.3 2.4
Total aggregate unpaid balance 12.3 103.9 86.6 223.4 12.3 103.9
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     1.0 (0.9)    
Total distributed in the period     (18.7) (28.8)    
Total liability balance of Loan Notes, Ending Balance 2.9 24.8 2.9 24.8    
Loan notes (long-term liabilities)         0.0 24.2
Accrued expenses (current liabilities)         2.9 0.6
Total aggregate unpaid balance $ 2.9 $ 24.8 20.6 54.5 $ 2.9 $ 24.8
Aspen Holdings | Third party            
Movement in Silverton Loan Notes [Roll Forward]            
Total change in fair value for the period     $ 5.1 $ (4.5)