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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of products sold, excluding depreciation and amortization and other items | $ 298,000,000.0 | $ 298,600,000 | $ 303,500,000 | $ 315,100,000 | $ 317,300,000 | $ 323,300,000 | $ 343,400,000 | $ 316,700,000 | $ 1,215,200,000 | [1] | $ 1,300,700,000 | [1] | $ 1,085,900,000 | [1] |  |  |  |  |
Derivative, Net Liability Position, Aggregate Fair Value | 7,200,000 |  |  |  | $ 12,600,000 |  |  |  | 7,200,000 |  | 12,600,000 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  | $ (5,500,000) |  |  |  |  |  |  |  |  |  |
Scenario, Forecast | Natural Gas Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Percent of Required Need, Coverage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 77.00% | 83.00% | 83.00% | 78.00% | 80.00%
Scenario, Forecast | Electricity [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Percent of Required Need, Coverage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.00% | 55.00% | 55.00%
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
OCI, before Reclassifications, before Tax, Attributable to Parent |  |  |  |  |  |  |  |  | $ (9,500,000) |  | $ (21,200,000) |  | $ 1,800,000 |  |  |  |  |  |
[1] | See Note 8 for discussion of our adoption of ASU 2017-12 (as defined in Note 1) in 2018 and the related reclassification of amounts in 2017 that were presented in the Statements of Consolidated Income within Unrealized (gain) loss on derivative instruments and are now presented within Cost of products sold, excluding depreciation and amortization and other items ("Cost of products sold").

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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 Cost of product sold and service rendered, excluding depreciation, depletion, and amortization. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(2)(a)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(2)(d)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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