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Variable Interest Entities - Summary of Silverton Loan Notes (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2016
Movement in Silverton Loan Notes [Roll Forward] |  |  |  |  |
Total change in fair value for the period | $ (2.9) | $ (4.4) |  |  |
Third party |  |  |  |  |
Movement in Silverton Loan Notes [Roll Forward] |  |  |  |  |
Total liability balance of Loan Notes, Beginning Balance | 223.4 | 190.6 | $ 190.6 |  |
Total change in fair value for the period | 2.9 | 4.4 |  |  |
Total distributed in the period | (111.2) | (87.4) |  |  |
Total liability balance of Loan Notes, Ending Balance | 115.1 | 107.6 | 223.4 |  |
Loan notes (long-term liabilities) |  |  |  | $ 110.2 | $ 104.5
Accrued expenses (current liabilities) |  |  |  | 4.9 | 3.1
Total aggregate unpaid balance | 223.4 | 190.6 | 190.6 | 115.1 | 107.6
Aspen Holdings |  |  |  |  |
Movement in Silverton Loan Notes [Roll Forward] |  |  |  |  |
Total liability balance of Loan Notes, Beginning Balance | 54.5 | 44.4 | 44.4 |  |
Total change in fair value for the period | 0.7 | 1.1 |  |  |
Total distributed in the period | (28.3) | (19.0) |  |  |
Total liability balance of Loan Notes, Ending Balance | 26.9 | 26.5 | 54.5 |  |
Loan notes (long-term liabilities) |  |  |  | 26.9 | 25.9
Accrued expenses (current liabilities) |  |  |  | 0.0 | 0.6
Total aggregate unpaid balance | 54.5 | 44.4 | 44.4 | 26.9 | 26.5
Aspen Holdings and Third Parties |  |  |  |  |
Movement in Silverton Loan Notes [Roll Forward] |  |  |  |  |
Total liability balance of Loan Notes, Beginning Balance | 277.9 | 235.0 | 235.0 |  |
Total change in fair value for the period | 3.6 | 5.5 |  |  |
Total distributed in the period | (139.5) | (106.4) |  |  |
Total liability balance of Loan Notes, Ending Balance | 142.0 | 134.1 | 277.9 |  |
Loan notes (long-term liabilities) |  |  |  | 137.1 | 130.4
Accrued expenses (current liabilities) |  |  |  | 4.9 | 3.7
Total aggregate unpaid balance | $ 277.9 | $ 235.0 | $ 235.0 | $ 142.0 | $ 134.1

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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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- 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=66902209&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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