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Variable Interest Entities (Tables) | 12 Months Ended
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Dec. 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 twelve months ended December 31, 2017 and 2016:
|  | For the Twelve Months Ended December 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 |  | (21.2 | ) |  | (5.3 | ) |  | (26.5 | )
Total distributed in the period |  | (115.6 | ) |  | (28.6 | ) |  | (144.2 | )
Total issued in the period |  | — |  |  | — |  |  | — |
Closing balance as at December 31, 2017 |  | $ | 86.6 |  |  | $ | 20.6 |  |  | $ | 107.2 |
Liability |  |  |  |  |  |
Loan notes (long-term liabilities) |  | $ | 44.2 |  |  | $ | 10.5 |  |  | $ | 54.7 |
Accrued expenses (current liabilities) |  | 42.4 |  |  | 10.1 |  |  | 52.5 |
Total aggregate unpaid balance as at December 31, 2017 |  | $ | 86.6 |  |  | $ | 20.6 |  |  | $ | 107.2 |
|  | For the Twelve Months Ended December 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 |  | 17.1 |  |  | 4.3 |  |  | 21.4 |
Total distributed in the period |  | (89.3 | ) |  | (19.2 | ) |  | (108.5 | )
Total issued in the period |  | 105.0 |  |  | 25.0 |  |  | 130.0 |
Closing balance as at December 31, 2016 |  | $ | 223.4 |  |  | $ | 54.5 |  |  | $ | 277.9 |
Liability |  |  |  |  |  |
Loan notes (long-term liabilities) |  | $ | 115.0 |  |  | $ | 27.0 |  |  | $ | 142.0 |
Accrued expenses (current liabilities) |  | 108.4 |  |  | 27.5 |  |  | 135.9 |
Total aggregate unpaid balance as at December 31, 2016 |  | $ | 223.4 |  |  | $ | 54.5 |  |  | $ | 277.9 |

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