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Derivatives, Hedging Programs and Other Financial Instruments, Realized and Unrealized Gains (Losses) Table (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Derivative Instruments Gain Loss [Line Items] |  |
Cost of products sold, excluding depreciation and amortization and other items | $ 286.6 | $ 315.1
Depreciation and amortization | 13.2 | 11.9
Cash Flow Hedges | Cost of Sales | Designated as Hedging Instrument |  |
Derivative Instruments Gain Loss [Line Items] |  |
Loss (gain) recognized in income related to cash flow hedges: | 7.0 | 4.2
Cash Flow Hedges | Cost of Sales | Aluminum | Designated as Hedging Instrument |  |
Derivative Instruments Gain Loss [Line Items] |  |
Loss (gain) recognized in income related to cash flow hedges: | 5.7 | 4.2
Cash Flow Hedges | Cost of Sales | Alloy Metal Hedge | Designated as Hedging Instrument |  |
Derivative Instruments Gain Loss [Line Items] |  |
Loss (gain) recognized in income related to cash flow hedges: | 0.6 | 0.1
Cash Flow Hedges | Cost of Sales | Natural Gas | Designated as Hedging Instrument |  |
Derivative Instruments Gain Loss [Line Items] |  |
Loss (gain) recognized in income related to cash flow hedges: | 0.5 | (0.1)
Cash Flow Hedges | Cost of Sales | Electricity | Designated as Hedging Instrument |  |
Derivative Instruments Gain Loss [Line Items] |  |
Loss (gain) recognized in income related to cash flow hedges: | 0.2 | 0.0
Fair Value Hedges | Depreciation and Amortization | Foreign Exchange Contract | Designated as Hedging Instrument |  |
Derivative Instruments Gain Loss [Line Items] |  |
Loss (gain) recognized in income related to cash flow hedges: | 0.2 | 0.0
Foreign exchange contracts | 0.2 | 0.0
Hedged item | (0.2) | 0.0
Excluded component amortized from AOCI to income | $ 0.2 | $ 0.0

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- Definition Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109977999&loc=d3e76258-113986 + Details
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- Definition Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109977999&loc=d3e76258-113986 + 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=116634182&loc=SL114868664-224227 + Details
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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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