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Variable Interest Entities - Summary of Silverton Loan Notes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Movement in Silverton Loan Notes [Roll Forward] |  |  |  |  |  |
Total liability balance of Loan Notes, Beginning Balance |  |  | $ 277.9 | $ 235.0 |  |
Total change in fair value for the period | $ (3.3) | $ 0.5 | (6.2) | (3.9) |  |
Total distributed in the period |  |  | (142.7) | (108.4) |  |
Total liability balance of Loan Notes, Ending Balance | 143.0 | 131.5 | 143.0 | 131.5 |  |
Loan notes (long-term liabilities) |  |  |  |  | $ 137.2 | $ 129.8
Accrued expenses (current liabilities) |  |  |  |  | 5.8 | 1.7
Total aggregate unpaid balance | 143.0 | 131.5 | 277.9 | 235.0 | 143.0 | 131.5
Third party |  |  |  |  |  |
Movement in Silverton Loan Notes [Roll Forward] |  |  |  |  |  |
Total liability balance of Loan Notes, Beginning Balance |  |  | 223.4 | 190.6 |  |
Total change in fair value for the period |  |  | 6.2 | 3.9 |  |
Total distributed in the period |  |  | (114.1) | (89.0) |  |
Total liability balance of Loan Notes, Ending Balance | 115.5 | 105.5 | 115.5 | 105.5 |  |
Loan notes (long-term liabilities) |  |  |  |  | 110.8 | 104.1
Accrued expenses (current liabilities) |  |  |  |  | 4.7 | 1.4
Total aggregate unpaid balance | 115.5 | 105.5 | 223.4 | 190.6 | 115.5 | 105.5
Aspen Holdings |  |  |  |  |  |
Movement in Silverton Loan Notes [Roll Forward] |  |  |  |  |  |
Total liability balance of Loan Notes, Beginning Balance |  |  | 54.5 | 44.4 |  |
Total change in fair value for the period |  |  | 1.6 | 1.0 |  |
Total distributed in the period |  |  | (28.6) | (19.4) |  |
Total liability balance of Loan Notes, Ending Balance | 27.5 | 26.0 | 27.5 | 26.0 |  |
Loan notes (long-term liabilities) |  |  |  |  | 26.4 | 25.7
Accrued expenses (current liabilities) |  |  |  |  | 1.1 | 0.3
Total aggregate unpaid balance | $ 27.5 | $ 26.0 | 54.5 | 44.4 | $ 27.5 | $ 26.0
Aspen Holdings | Third party |  |  |  |  |  |
Movement in Silverton Loan Notes [Roll Forward] |  |  |  |  |  |
Total change in fair value for the period |  |  | $ 7.8 | $ 4.9 |  |

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