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Variable Interest Entities (Tables)
3 Months Ended
Mar. 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 three months ended March 31, 2018 and 2017:
 
 
For the Three Months Ended March 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
 
(1.0
)
 
(0.3
)
 
(1.3
)
Total distributed in the period
 
(45.8
)
 
(10.7
)
 
(56.5
)
Closing balance as at March 31, 2018
 
$
39.8

 
$
9.6

 
$
49.4

 
 
 
 
 
 
 
Liability
 
 
 
 
 
 
Loan notes (long-term liabilities)
 
$
32.2

 
$
7.7

 
$
39.9

Accrued expenses (current liabilities)
 
7.6

 
1.9

 
9.5

Total aggregate unpaid balance as at March 31, 2018
 
$
39.8

 
$
9.6

 
$
49.4

 
 
For the Three Months Ended March 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
 
2.9

 
0.7

 
3.6

Total distributed in the period
 
(111.2
)
 
(28.3
)
 
(139.5
)
Closing balance as at March 31, 2017
 
$
115.1

 
$
26.9

 
$
142.0

 
 
 
 
 
 
 
Liability
 
 
 
 
 
 
Loan notes (long-term liabilities)
 
$
110.2

 
$
26.9

 
$
137.1

Accrued expenses (current liabilities)
 
4.9

 

 
4.9

Total aggregate unpaid balance as at March 31, 2017
 
$
115.1

 
$
26.9

 
$
142.0