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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, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue, Major Customer [Line Items]
Total GM postretirement cost sharing asset	$ 250.0	$ 236.0
General Motors [Member]
Revenue, Major Customer [Line Items]
Entity-wide revenue, major customer, percentage	39.00%	37.00%	41.00%
Fair value, concentration of risk, accounts receivable	$ 297.5	$ 328.5
FCA [Member]
Revenue, Major Customer [Line Items]
Entity-wide revenue, major customer, percentage	19.00%	17.00%	13.00%
Fair value, concentration of risk, accounts receivable	$ 157.0	$ 154.8
Ford [Member]
Revenue, Major Customer [Line Items]
Entity-wide revenue, major customer, percentage	12.00%	9.00%	8.00%
Fair value, concentration of risk, accounts receivable	$ 116.5	$ 111.7

X

- 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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X

- 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
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- Definition

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.

+ References

No definition available.

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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