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Variable Interest Entities (Tables)
 12 Months Ended
Dec. 31, 2018
Payables and Accruals [Abstract]  
Summary of Silverton Loan Notes
The following tables show the total liability balance of the Loan Notes for the twelve months ended December 31, 2018 and 2017:
 
 
For the Twelve Months Ended December 31, 2018
 
 
Third Party
 
Aspen Holdings
 
Total
 
 
($ in millions)
Opening balance
 
$
86.6

 
$
20.6

 
$
107.2

Total change in fair value for the period
 
4.4

 
1.1

 
5.5

Total distributed in the period
 
(86.4
)
 
(20.6
)
 
(107.0
)
Closing balance as at December 31, 2018
 
$
4.6

 
$
1.1

 
$
5.7

 
 
 
 
 
 
 
Liability
 
 
 
 
 
 
Loan notes (long-term liabilities)
 
$
—

 
$
—

 
$
—

Accrued expenses (current liabilities)
 
4.6

 
1.1

 
5.7

Total aggregate unpaid balance as at December 31, 2018
 
$
4.6

 
$
1.1

 
$
5.7

 
 
For the Twelve Months Ended December 31, 2017
 
 
Third Party
 
Aspen Holdings
 
Total
 
 
($ in millions)
Opening balance
 
$
223.4

 
$
54.5

 
$
277.9

Total change in fair value for the period
 
(21.2
)
 
(5.3
)
 
(26.5
)
Total distributed in the period
 
(115.6
)
 
(28.6
)
 
(144.2
)
Closing balance as at December 31, 2017
 
$
86.6

 
$
20.6

 
$
107.2

 
 
 
 
 
 
 
Liability
 
 
 
 
 
 
Loan notes (long-term liabilities)
 
$
44.2

 
$
10.5

 
$
54.7

Accrued expenses (current liabilities)
 
42.4

 
10.1

 
52.5

Total aggregate unpaid balance as at December 31, 2017
 
$
86.6

 
$
20.6

 
$
107.2