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Variable Interest Entities Summary of Silverton Loan Notes (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Movement in Silverton Loan Notes [Roll Forward] |  |  |
Opening balance | $ 0.0 | $ 5.7 |
Total change in fair value for the period | 0.0 | (3.1) | $ (4.4)
Total distributed in the period | 0.0 | (9.6) |
Closing balance as at December 31, 2020 | 0.0 | 0.0 | 5.7
Loan notes (long-term liabilities) | 0.0 | 0.0 |
Accrued expenses (current liabilities) | 0.0 | 0.0 |
Third party |  |  |
Movement in Silverton Loan Notes [Roll Forward] |  |  |
Opening balance | 0.0 | 4.6 |
Total change in fair value for the period | 0.0 | 3.1 |
Total distributed in the period | 0.0 | (7.7) |
Closing balance as at December 31, 2020 | 0.0 | 0.0 | 4.6
Loan notes (long-term liabilities) | 0.0 | 0.0 |
Accrued expenses (current liabilities) | 0.0 | 0.0 |
Aspen Holdings |  |  |
Movement in Silverton Loan Notes [Roll Forward] |  |  |
Opening balance | 0.0 | 1.1 |
Total change in fair value for the period | 0.0 | 0.8 |
Total distributed in the period | 0.0 | (1.9) |
Closing balance as at December 31, 2020 | 0.0 | 0.0 | $ 1.1
Loan notes (long-term liabilities) | 0.0 | 0.0 |
Accrued expenses (current liabilities) | 0.0 | 0.0 |
Aspen Holdings | Third party |  |  |
Movement in Silverton Loan Notes [Roll Forward] |  |  |
Total change in fair value for the period | $ 0.0 | $ 3.9 |

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