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.

No definition available.

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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.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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
	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%