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Variable Interest Entities (Tables)
12 Months Ended
Dec. 31, 2017
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, 2017 and 2016:
 
 
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
)
Total issued in the period
 

 

 

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

 
 
For the Twelve Months Ended December 31, 2016
 
 
Third Party
 
Aspen Holdings
 
Total
 
 
($ in millions)
Opening balance
 
$
190.6

 
$
44.4

 
$
235.0

Total change in fair value for the period
 
17.1

 
4.3

 
21.4

Total distributed in the period
 
(89.3
)
 
(19.2
)
 
(108.5
)
Total issued in the period
 
105.0

 
25.0

 
130.0

Closing balance as at December 31, 2016
 
$
223.4

 
$
54.5

 
$
277.9

 
 
 
 
 
 
 
Liability
 
 
 
 
 
 
Loan notes (long-term liabilities)
 
$
115.0

 
$
27.0

 
$
142.0

Accrued expenses (current liabilities)
 
108.4

 
27.5

 
135.9

Total aggregate unpaid balance as at December 31, 2016
 
$
223.4

 
$
54.5

 
$
277.9