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Variable Interest Entities (Tables)
9 Months Ended
Sep. 30, 2018
Payables and Accruals [Abstract]  
Summary of Silverton Loan Notes
The following tables show the total liability balance of the Loan Notes for the nine months ended September 30, 2018 and 2017:
 
 
For the Nine Months Ended September 30, 2018
 
 
Third Party
 
Aspen Holdings
 
Total
 
 
($ in millions)
Opening balance
 
$
86.6

 
$
20.6

 
$
107.2

Total change in fair value for the period
 
4.1

 
1.0

 
5.1

Total distributed in the period
 
(78.4
)
 
(18.7
)
 
(97.1
)
Closing balance as at September 30, 2018
 
$
12.3

 
$
2.9

 
$
15.2

 
 
 
 
 
 
 
Liability
 
 
 
 
 
 
Loan notes (long-term liabilities)
 
$

 
$

 
$

Accrued expenses (current liabilities)
 
12.3

 
2.9

 
15.2

Total aggregate unpaid balance as at September 30, 2018
 
$
12.3

 
$
2.9

 
$
15.2

 
 
For the Nine Months Ended September 30, 2017
 
 
Third Party
 
Aspen Holdings
 
Total
 
 
($ in millions)
Opening balance
 
$
223.4

 
$
54.5

 
$
277.9

Total change in fair value for the period
 
(3.6
)
 
(0.9
)
 
(4.5
)
Total distributed in the period
 
(115.9
)
 
(28.8
)
 
(144.7
)
Closing balance as at September 30, 2017
 
$
103.9

 
$
24.8

 
$
128.7

 
 
 
 
 
 
 
Liability
 
 
 
 
 
 
Loan notes (long-term liabilities)
 
$
101.5

 
$
24.2

 
$
125.7

Accrued expenses (current liabilities)
 
2.4

 
0.6

 
3.0

Total aggregate unpaid balance as at September 30, 2017
 
$
103.9

 
$
24.8

 
$
128.7