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Fair Value Measurements (Assets and Liabilities Carried at Fair Value on Recurring Basis) (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
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Level 1 [Member] |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis |  |
Investment in marketable equity securities | $ 4.7 | $ 4.4

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