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Fair Value Measurements (Narrative) (Details) lb in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) derivative_instrument lb $ / lb | Dec. 31, 2017 USD ($) lb $ / lb
Fair Value Disclosures [Abstract] |  |
Number of derivative instruments | derivative_instrument | 5 |
Derivative nonmonetary notional amount, mass | lb | 34.4 | 12.0
Underlying derivative mass | $ / lb | 0.39 | 0.25
Derivative liabilities | $ 1.1 |
Derivative liability, current | 0.9 |
Derivative liability, noncurrent | $ 0.2 |
Derivative asset |  | $ 0.9
Average long-term sales growth forecast, over next 4 years, percent per year | 13.00% |
Number of years long-term sales growth forecasted over | 6 years |

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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