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Variable Interest Entities (Tables)
3 Months Ended
Mar. 31, 2019
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, 2019 and 2018:
 
 
For the Three Months Ended March 31, 2019
 
 
Third Party
 
Aspen Holdings
 
Total
 
 
($ in millions)
Opening balance
 
$
4.6

 
$
20.6

 
$
25.2

Total change in fair value for the period
 
1.5

 
0.4

 
1.9

Total distributed in the period
 
(0.2
)
 
(19.6
)
 
(19.8
)
Closing balance as at March 31, 2019
 
$
5.9

 
$
1.4

 
$
7.3

 
 
 
 
 
 
 
Liability
 
 
 
 
 
 
Loan notes (long-term liabilities)
 
$

 
$

 
$

Accrued expenses (current liabilities)
 
5.9

 
1.4

 
7.3

Total aggregate unpaid balance as at March 31, 2019
 
$
5.9

 
$
1.4

 
$
7.3

 
 
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