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Variable Interest Entities Summary of Silverton Loan Notes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Movement in Silverton Loan Notes [Roll Forward]      
Opening balance $ 0.0 $ 5.7  
Total change in fair value for the period 0.0 (3.1) $ (4.4)
Total distributed in the period 0.0 (9.6)  
Closing balance as at December 31, 2020 0.0 0.0 5.7
Loan notes (long-term liabilities) 0.0 0.0  
Accrued expenses (current liabilities) 0.0 0.0  
Third party      
Movement in Silverton Loan Notes [Roll Forward]      
Opening balance 0.0 4.6  
Total change in fair value for the period 0.0 3.1  
Total distributed in the period 0.0 (7.7)  
Closing balance as at December 31, 2020 0.0 0.0 4.6
Loan notes (long-term liabilities) 0.0 0.0  
Accrued expenses (current liabilities) 0.0 0.0  
Aspen Holdings      
Movement in Silverton Loan Notes [Roll Forward]      
Opening balance 0.0 1.1  
Total change in fair value for the period 0.0 0.8  
Total distributed in the period 0.0 (1.9)  
Closing balance as at December 31, 2020 0.0 0.0 $ 1.1
Loan notes (long-term liabilities) 0.0 0.0  
Accrued expenses (current liabilities) 0.0 0.0  
Aspen Holdings | Third party      
Movement in Silverton Loan Notes [Roll Forward]      
Total change in fair value for the period $ 0.0 $ 3.9