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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Revenue, Major Customer [Line Items] |  |  |
Total GM postretirement cost sharing asset | $ 213.2 | $ 250.0 |
General Motors [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Fair value, concentration of risk, accounts receivable | $ 290.2 | $ 297.5 |
General Motors [Member] | Customer Concentration Risk | Revenue Benchmark |  |  |
Revenue, Major Customer [Line Items] |  |  |
Entity-wide revenue, major customer, percentage | 37.00% | 39.00% | 37.00%
Stellantis [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Fair value, concentration of risk, accounts receivable | $ 137.1 | $ 157.0 |
Stellantis [Member] | Customer Concentration Risk | Revenue Benchmark |  |  |
Revenue, Major Customer [Line Items] |  |  |
Entity-wide revenue, major customer, percentage | 19.00% | 19.00% | 17.00%
Ford [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Fair value, concentration of risk, accounts receivable | $ 108.8 | $ 116.5 |
Ford [Member] | Customer Concentration Risk | Revenue Benchmark |  |  |
Revenue, Major Customer [Line Items] |  |  |
Entity-wide revenue, major customer, percentage | 12.00% | 12.00% | 9.00%

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9054-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13531-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13537-108611 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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