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Fair Value Measurements (Assets and Liabilities Carried at Fair Value on Recurring Basis) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Level 1 [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Investment in marketable equity securities	$ 0.0	$ 4.1

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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