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Goodwill Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2021
Goodwill [Line Items]
Goodwill impairment charge	$ 510.0
Goodwill, Impaired, Facts and Circumstances Leading to Impairment	These impairment charges were primarily the result of a decline in the projected cash flows of these reporting units under our revised long-range plan completed in the first quarter of 2020. The revision to our long-range plan was driven by lower forecasted sales volumes in the internal and external data sources used to form our projections primarily due to the reduction in global automotive production volumes caused by the impact of COVID-19. The impairment charges were also the result of changes in certain market-related inputs to the analysis to reflect macro-economic changes caused by the impact of COVID-19, including increased discount rates and lower pricing multiples for comparable public companies.
Goodwill, Impaired, Accumulated Impairment Loss		$ 1,435.5
Driveline [Member]
Goodwill [Line Items]
Goodwill impairment charge	$ 210.8
Metal Forming [Member]
Goodwill [Line Items]
Goodwill impairment charge	$ 299.2

X

- Definition

Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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Description of the underlying cause of impairment of goodwill, such as a significant and more than temporary reduction in sales of a business unit.

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