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Derivatives, Hedging Programs and Other Financial Instruments, Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |  |
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Net Liability Position, Aggregate Fair Value | $ 12,600,000 |  |  |  | $ 100,000 |  |  |  | $ 12,600,000 |  | $ 100,000 |  |  |  |  |  |
Cost of Goods and Services Sold | 317,300,000 | $ 323,300,000 | $ 343,400,000 | $ 316,700,000 | $ 277,200,000 | $ 256,400,000 | $ 289,600,000 | $ 262,700,000 | 1,300,700,000 | [1] | 1,085,900,000 | [1] | $ 1,000,800,000 | [1] |  |  |
Margin deposits with counterparties | 0 |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Customer Deposits, Current | $ 200,000 |  |  |  |  |  |  |  | $ 200,000 |  |  |  |  |  |  |  |
Debt Instrument, Term |  |  |  |  |  |  |  |  | 12 months |  |  |  |  |  |  |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months |  |  |  |  |  |  |  |  | $ (15,600,000) |  |  |  |  |  |  |  |
Scenario, Forecast | Natural Gas Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Percent of Required Need, Coverage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 66.00%
Scenario, Forecast | Electricity [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Percent of Required Need, Coverage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.00% | 55.00% | 54.00%
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
OCI, before Reclassifications, before Tax, Attributable to Parent |  |  |  |  |  |  |  |  | $ (21,200,000) |  | $ 1,800,000 |  | $ (100,000) |  |  |  |
[1] | See Note 7 for discussion of our adoption of ASU 2017-12 (as defined in Note 1) and the related reclassification of amounts previously presented in the Statements of Consolidated Income within Unrealized (gain) loss on derivative instruments and now included within Cost of products sold, excluding depreciation and amortization and other items.

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994 + Details
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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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- Definition The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624258-113959 + Details
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