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Variable Interest Entities (Tables) | 9 Months Ended
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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 |

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