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Variable Interest Entities - Summary of Silverton Loan Notes (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 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 | 1.0 | (2.9) |  |
Total distributed in the period | (56.5) | (139.5) |  |
Total liability balance of Loan Notes, Ending Balance | 49.4 | 142.0 |  |
Loan notes (long-term liabilities) |  |  | $ 39.9 | $ 137.1
Accrued expenses (current liabilities) |  |  | 9.5 | 4.9
Total aggregate unpaid balance | 107.2 | 277.9 | 49.4 | 142.0
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 | (1.0) | 2.9 |  |
Total distributed in the period | (45.8) | (111.2) |  |
Total liability balance of Loan Notes, Ending Balance | 39.8 | 115.1 |  |
Loan notes (long-term liabilities) |  |  | 32.2 | 110.2
Accrued expenses (current liabilities) |  |  | 7.6 | 4.9
Total aggregate unpaid balance | 86.6 | 223.4 | 39.8 | 115.1
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 | (0.3) | 0.7 |  |
Total distributed in the period | (10.7) | (28.3) |  |
Total liability balance of Loan Notes, Ending Balance | 9.6 | 26.9 |  |
Loan notes (long-term liabilities) |  |  | 7.7 | 26.9
Accrued expenses (current liabilities) |  |  | 1.9 | 0.0
Total aggregate unpaid balance | 20.6 | 54.5 | $ 9.6 | $ 26.9
Aspen Holdings | Third party |  |  |  |
Movement in Silverton Loan Notes [Roll Forward] |  |  |  |
Total change in fair value for the period | $ (1.3) | $ 3.6 |  |

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- Definition The amount for notes payable (written promise to pay), due to related parties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.17) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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