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Redeemable Securities (Details) - USD ($) $ in Millions | May 18, 2017 | Mar. 11, 2016
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Business Acquisition [Line Items] |  |
Equity Method Investment, Ownership Percentage |  | 19.90%
Hitachi Chemical Co., LTD [Member] |  |
Business Acquisition [Line Items] |  |
Recorded Unconditional Purchase Obligation |  | $ 19.4
Equity Method Investment, Ownership Percentage |  | 21.00%
Business Combination, Consideration Transfered, Interest Rate |  | 2.00%
Redeemable Securities Agreement, Required Purchase Based on Equity Event, Maximum |  | $ 20.5
Redeemable Securities, Classified to Additional Paid In Capital | $ 14.7 |
Redeemable Securities, Classified to Non-Controlling Interests | $ 4.7 |

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