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Variable Interest Entities (Tables)
 12 Months Ended
Dec. 31, 2020
Payables and Accruals [Abstract]  
Summary of Loan Notes
The following tables show the total liability balance of the Loan Notes for the twelve months ended December 31, 2020 and 2019:
For the Twelve Months Ended December 31, 2020
Third Party Aspen HoldingsTotal
($ in millions)
Opening balance $— $— $— 
Total change in fair value for the period— — — 
Total distributed in the period— — — 
Closing balance as at December 31, 2020$— $— $— 
Liability
Loan notes (long-term liabilities)$— $— $— 
Accrued expenses (current liabilities)— — — 
Total aggregate unpaid balance as at December 31, 2020$— $— $— 
For the Twelve Months Ended December 31, 2019
Third Party Aspen HoldingsTotal
($ in millions)
Opening balance $4.6 $1.1 $5.7 
Total change in fair value for the period3.1 0.8 3.9 
Total distributed in the period(7.7)(1.9)(9.6)
Closing balance as at December 31, 2019$— $— $— 
Liability
Loan notes (long-term liabilities)$— $— $— 
Accrued expenses (current liabilities)— — — 
Total aggregate unpaid balance as at December 31, 2019$— $— $—