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Variable Interest Entities Summary of Silverton Loan Notes (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Movement in Silverton Loan Notes [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Opening balance |  |  |  | $ 107.2 |  |  |  | $ 277.9 |  |  |  |  | $ 107.2 | $ 277.9 |
Total change in fair value for the period | $ (0.3) | $ (1.7) | $ (3.4) | 1.0 | $ 17.6 | $ 9.8 | $ (3.3) | (2.9) | $ (3.4) | $ (9.8) | $ 0.5 | $ (4.4) | (4.4) | 21.2 | $ (17.1)
Total distributed in the period |  |  |  |  |  |  |  |  |  |  |  |  | (107.0) | (144.2) |
Closing balance as at December 31, 2018 | 5.7 |  |  |  | 107.2 |  |  |  | 277.9 |  |  |  | 5.7 | 107.2 | 277.9
Loan notes (long-term liabilities) | 0.0 |  |  |  | 54.7 |  |  |  |  |  |  |  | 0.0 | 54.7 |
Accrued expenses (current liabilities) | 5.7 |  |  |  | 52.5 |  |  |  |  |  |  |  | 5.7 | 52.5 |
Third party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Movement in Silverton Loan Notes [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Opening balance |  |  |  | 86.6 |  |  |  | 223.4 |  |  |  |  | 86.6 | 223.4 |
Total change in fair value for the period |  |  |  |  |  |  |  |  |  |  |  |  | 4.4 | (21.2) |
Total distributed in the period |  |  |  |  |  |  |  |  |  |  |  |  | (86.4) | (115.6) |
Closing balance as at December 31, 2018 | 4.6 |  |  |  | 86.6 |  |  |  | 223.4 |  |  |  | 4.6 | 86.6 | 223.4
Loan notes (long-term liabilities) | 0.0 |  |  |  | 44.2 |  |  |  |  |  |  |  | 0.0 | 44.2 |
Accrued expenses (current liabilities) | 4.6 |  |  |  | 42.4 |  |  |  |  |  |  |  | 4.6 | 42.4 |
Aspen Holdings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Movement in Silverton Loan Notes [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Opening balance |  |  |  | $ 20.6 |  |  |  | $ 54.5 |  |  |  |  | 20.6 | 54.5 |
Total change in fair value for the period |  |  |  |  |  |  |  |  |  |  |  |  | 1.1 | (5.3) |
Total distributed in the period |  |  |  |  |  |  |  |  |  |  |  |  | (20.6) | (28.6) |
Closing balance as at December 31, 2018 | 1.1 |  |  |  | 20.6 |  |  |  | $ 54.5 |  |  |  | 1.1 | 20.6 | $ 54.5
Loan notes (long-term liabilities) | 0.0 |  |  |  | 10.5 |  |  |  |  |  |  |  | 0.0 | 10.5 |
Accrued expenses (current liabilities) | $ 1.1 |  |  |  | $ 10.1 |  |  |  |  |  |  |  | 1.1 | 10.1 |
Aspen Holdings | Third party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Movement in Silverton Loan Notes [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total change in fair value for the period |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.5 | $ (26.5) |

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