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Investments - Equity Method Limited Liability Investments (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
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Investments, Debt and Equity Securities [Abstract] |  |
Equity Method Limited Liability Investments, Maximum Exposure to Loss | $ 170.9 | $ 161.0
Outstanding Commitments to Fund Equity Method Limited Liability Investments | $ 97.5 |

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- Definition Amount of investment in equity method investee and investment in and advance to affiliate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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