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Commitments And Contingencies (Narrative) (Details) - USD ($) shares in Millions, $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2018 | Nov. 01, 2018 | Apr. 01, 2018
Other Commitments [Line Items] |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  | 120 |
East China JV [Member] |  |  |  |
Other Commitments [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  | 50.00%
Payments to Acquire Interest in Joint Venture | $ 1,440.8 |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value | $ 1,440.8 | $ 1,400.0 |  |
Taiwan JV [Member] |  |  |  |
Other Commitments [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  | 50.00%

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