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Derivatives and Risk Management - Sales, Receivables and Postretirement Cost Sharing Asset by Major Customer Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Revenue, Major Customer [Line Items] |  |  |
Total GM postretirement cost sharing asset | $ 120.0 | $ 138.2 |
General Motors [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Fair value, concentration of risk, accounts receivable | $ 305.7 | $ 334.4 |
General Motors [Member] | Customer Concentration Risk | Revenue Benchmark |  |  |
Revenue, Major Customer [Line Items] |  |  |
Entity-wide revenue, major customer, percentage | 39.00% | 40.00% | 37.00%
Stellantis [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Fair value, concentration of risk, accounts receivable | $ 108.1 | $ 115.3 |
Stellantis [Member] | Customer Concentration Risk | Revenue Benchmark |  |  |
Revenue, Major Customer [Line Items] |  |  |
Entity-wide revenue, major customer, percentage | 16.00% | 18.00% | 19.00%
Ford [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Fair value, concentration of risk, accounts receivable | $ 118.1 | $ 101.7 |
Ford [Member] | Customer Concentration Risk | Revenue Benchmark |  |  |
Revenue, Major Customer [Line Items] |  |  |
Entity-wide revenue, major customer, percentage | 12.00% | 12.00% | 12.00%

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- Definition Aggregate of the current and noncurrent amounts estimated to be received from General Motors Company (GM) associated with an agreement between us and GM to share proportionally in the cost of other postretirement employee benefits for eligible retirees based on the length of service an employee had with us and GM. + References No definition available. + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-42 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-21 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-20 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482861/275-10-50-18 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482861/275-10-50-20 + Details
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- Definition This item represents disclosure of all significant concentrations of credit risk or market risk arising from the subject financial instrument (as defined), whether from an individual counterparty or groups of counterparties. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-21 + Details
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