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Related Parties (Details) - Pension Plans [Member] - Investment Management Services for Defined Benefit Plan [Member] - FS&C [Member] - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Related Party Transaction [Line Items] |  |
Assets under Management, Carrying Amount | $ 153.0 |
Investment expenses | $ 0.2 | $ 0.2

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