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Variable Interest Entities (Tables)
 9 Months Ended
Sep. 30, 2017
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, 2017 and 2016:
 
 
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

 
 
For the Nine Months Ended September 30, 2016
 
 
Third Party
 
Aspen Holdings
 
Total
 
 
($ in millions)
Opening balance
 
$
190.6

 
$
44.4

 
$
235.0

Total change in fair value for the period
 
13.7

 
3.4

 
17.1

Total distributed in the period
 
(89.3
)
 
(19.4
)
 
(108.7
)
Closing balance as at September 30, 2016
 
$
115.0

 
$
28.4

 
$
143.4

 
 
 
 
 
 
 
Liability
 
 
 
 
 
 
Loan notes (long-term liabilities)
 
$
112.7

 
$
27.9

 
$
140.6

Accrued expenses (current liabilities)
 
2.3

 
0.5

 
2.8

Total aggregate unpaid balance as at September 30, 2016
 
$
115.0

 
$
28.4

 
$
143.4