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Variable Interest Entities (Tables) | 6 Months Ended
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Jun. 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 six months ended June 30, 2018 and 2017:
|  | For the Six Months Ended June 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 |  | 2.4 |  |  | 0.6 |  |  | 3.0 |
Total distributed in the period |  | (63.7 | ) |  | (14.7 | ) |  | (78.4 | )
Closing balance as at June 30, 2018 |  | $ | 25.3 |  |  | $ | 6.5 |  |  | $ | 31.8 |
Liability |  |  |  |  |  |
Loan notes (long-term liabilities) |  | $ | 20.3 |  |  | $ | 5.2 |  |  | $ | 25.5 |
Accrued expenses (current liabilities) |  | 5.0 |  |  | 1.3 |  |  | 6.3 |
Total aggregate unpaid balance as at June 30, 2018 |  | $ | 25.3 |  |  | $ | 6.5 |  |  | $ | 31.8 |
|  | For the Six Months Ended June 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 |  | 6.2 |  |  | 1.6 |  |  | 7.8 |
Total distributed in the period |  | (114.1 | ) |  | (28.6 | ) |  | (142.7 | )
Closing balance as at June 30, 2017 |  | $ | 115.5 |  |  | $ | 27.5 |  |  | $ | 143.0 |
Liability |  |  |  |  |  |
Loan notes (long-term liabilities) |  | $ | 110.8 |  |  | $ | 26.4 |  |  | $ | 137.2 |
Accrued expenses (current liabilities) |  | 4.7 |  |  | 1.1 |  |  | 5.8 |
Total aggregate unpaid balance as at June 30, 2017 |  | $ | 115.5 |  |  | $ | 27.5 |  |  | $ | 143.0 |

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- Definition Summary of Silverton Loan Notes [Table Text Block] + References No definition available. + Details
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