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Variable Interest Entities - Summary of Silverton Loan Notes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Movement in Silverton Loan Notes [Roll Forward] |  |  |  |  |  |
Total liability balance of Loan Notes, Beginning Balance |  |  | $ 107.2 | $ 277.9 |  |
Total change in fair value for the period | $ (3.4) | $ (3.3) | (2.4) | (6.2) |  |
Total distributed in the period |  |  | (78.4) | (142.7) |  |
Total liability balance of Loan Notes, Ending Balance | 31.8 | 143.0 | 31.8 | 143.0 |  |
Loan notes (long-term liabilities) |  |  |  |  | $ 25.5 | $ 137.2
Accrued expenses (current liabilities) |  |  |  |  | 6.3 | 5.8
Total aggregate unpaid balance | 31.8 | 143.0 | 107.2 | 277.9 | 31.8 | 143.0
Third party |  |  |  |  |  |
Movement in Silverton Loan Notes [Roll Forward] |  |  |  |  |  |
Total liability balance of Loan Notes, Beginning Balance |  |  | 86.6 | 223.4 |  |
Total change in fair value for the period |  |  | 2.4 | 6.2 |  |
Total distributed in the period |  |  | (63.7) | (114.1) |  |
Total liability balance of Loan Notes, Ending Balance | 25.3 | 115.5 | 25.3 | 115.5 |  |
Loan notes (long-term liabilities) |  |  |  |  | 20.3 | 110.8
Accrued expenses (current liabilities) |  |  |  |  | 5.0 | 4.7
Total aggregate unpaid balance | 25.3 | 115.5 | 86.6 | 223.4 | 25.3 | 115.5
Aspen Holdings |  |  |  |  |  |
Movement in Silverton Loan Notes [Roll Forward] |  |  |  |  |  |
Total liability balance of Loan Notes, Beginning Balance |  |  | 20.6 | 54.5 |  |
Total change in fair value for the period |  |  | 0.6 | 1.6 |  |
Total distributed in the period |  |  | (14.7) | (28.6) |  |
Total liability balance of Loan Notes, Ending Balance | 6.5 | 27.5 | 6.5 | 27.5 |  |
Loan notes (long-term liabilities) |  |  |  |  | 5.2 | 26.4
Accrued expenses (current liabilities) |  |  |  |  | 1.3 | 1.1
Total aggregate unpaid balance | $ 6.5 | $ 27.5 | 20.6 | 54.5 | $ 6.5 | $ 27.5
Aspen Holdings | Third party |  |  |  |  |  |
Movement in Silverton Loan Notes [Roll Forward] |  |  |  |  |  |
Total change in fair value for the period |  |  | $ 3.0 | $ 7.8 |  |

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- Definition The cash inflow from a loan, supported by a promissory note, granted to related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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