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Variable Interest Entities (Tables) | 3 Months Ended
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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 |

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