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Variable Interest Entities (Tables)
 3 Months Ended
Mar. 31, 2017
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, 2017 and 2016:
 
 
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

 
 
For the Three Months Ended March 31, 2016
 
 
Third Party
 
Aspen Holdings
 
Total
 
 
($ in millions)
Opening balance
 
$
190.6

 
$
44.4

 
$
235.0

Total change in fair value for the period
 
4.4

 
1.1

 
5.5

Total distributed in the period
 
(87.4
)
 
(19.0
)
 
(106.4
)
Closing balance as at March 31, 2016
 
$
107.6

 
$
26.5

 
$
134.1

 
 
 
 
 
 
 
Liability
 
 
 
 
 
 
Loan notes (long-term liabilities)
 
$
104.5

 
$
25.9

 
$
130.4

Accrued expenses (current liabilities)
 
3.1

 
0.6

 
3.7

Total aggregate unpaid balance as at March 31, 2016
 
$
107.6

 
$
26.5

 
$
134.1