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Related Parties (Details) - FS&C [Member] - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2015 | Sep. 30, 2014
Trinity [Member] |  |
Related Party Transaction [Line Items] |  |
Investment expenses | $ 0.1 | $ 0.3
Pension Plans [Member] | Investment Management Services for Defined Benefit Plan [Member] |  |
Related Party Transaction [Line Items] |  |
Investment expenses | 0.3 | $ 0.3
Assets under Management, Carrying Amount | $ 149.5 |

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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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