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Variable Interest Entities - Summary of Silverton Loan Notes (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 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 $ (3.4) $ (3.3) (2.4) (6.2)    
Total distributed in the period     (78.4) (142.7)    
Total liability balance of Loan Notes, Ending Balance 31.8 143.0 31.8 143.0    
Loan notes (long-term liabilities)         $ 25.5 $ 137.2
Accrued expenses (current liabilities)         6.3 5.8
Total aggregate unpaid balance 31.8 143.0 107.2 277.9 31.8 143.0
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     2.4 6.2    
Total distributed in the period     (63.7) (114.1)    
Total liability balance of Loan Notes, Ending Balance 25.3 115.5 25.3 115.5    
Loan notes (long-term liabilities)         20.3 110.8
Accrued expenses (current liabilities)         5.0 4.7
Total aggregate unpaid balance 25.3 115.5 86.6 223.4 25.3 115.5
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     0.6 1.6    
Total distributed in the period     (14.7) (28.6)    
Total liability balance of Loan Notes, Ending Balance 6.5 27.5 6.5 27.5    
Loan notes (long-term liabilities)         5.2 26.4
Accrued expenses (current liabilities)         1.3 1.1
Total aggregate unpaid balance $ 6.5 $ 27.5 20.6 54.5 $ 6.5 $ 27.5
Aspen Holdings | Third party            
Movement in Silverton Loan Notes [Roll Forward]            
Total change in fair value for the period     $ 3.0 $ 7.8