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Variable Interest Entities (Tables) | 9 Months Ended
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Sep. 30, 2018
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, 2018 and 2017:
|  | For the Nine Months Ended September 30, 2018
|  | Third Party |  | Aspen Holdings |  | Total
|  | ($ in millions)
Opening balance |  | $ | 86.6 |  |  | $ | 20.6 |  |  | $ | 107.2 |
Total change in fair value for the period |  | 4.1 |  |  | 1.0 |  |  | 5.1 |
Total distributed in the period |  | (78.4 | ) |  | (18.7 | ) |  | (97.1 | )
Closing balance as at September 30, 2018 |  | $ | 12.3 |  |  | $ | 2.9 |  |  | $ | 15.2 |
Liability |  |  |  |  |  |
Loan notes (long-term liabilities) |  | $ | — |  |  | $ | — |  |  | $ | — |
Accrued expenses (current liabilities) |  | 12.3 |  |  | 2.9 |  |  | 15.2 |
Total aggregate unpaid balance as at September 30, 2018 |  | $ | 12.3 |  |  | $ | 2.9 |  |  | $ | 15.2 |
|  | 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 |

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- Definition Summary of Silverton Loan Notes [Table Text Block] + References No definition available. + Details
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Period Type: | duration