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Variable Interest Entities (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2017 and 2016:
 
 
For the Six Months Ended June 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
 
6.2

 
1.6

 
7.8

Total distributed in the period
 
(114.1
)
 
(28.6
)
 
(142.7
)
Closing balance as at June 30, 2017
 
$
115.5

 
$
27.5

 
$
143.0

 
 
 
 
 
 
 
Liability
 
 
 
 
 
 
Loan notes (long-term liabilities)
 
$
110.8

 
$
26.4

 
$
137.2

Accrued expenses (current liabilities)
 
4.7

 
1.1

 
5.8

Total aggregate unpaid balance as at June 30, 2017
 
$
115.5

 
$
27.5

 
$
143.0

 
 
For the Six Months Ended June 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
 
3.9

 
1.0

 
4.9

Total distributed in the period
 
(89.0
)
 
(19.4
)
 
(108.4
)
Closing balance as at June 30, 2016
 
$
105.5

 
$
26.0

 
$
131.5

 
 
 
 
 
 
 
Liability
 
 
 
 
 
 
Loan notes (long-term liabilities)
 
$
104.1

 
$
25.7

 
$
129.8

Accrued expenses (current liabilities)
 
1.4

 
0.3

 
1.7

Total aggregate unpaid balance as at June 30, 2016
 
$
105.5

 
$
26.0

 
$
131.5