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Goodwill Rollforward (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Goodwill [Roll Forward]
Goodwill	$ 699.1
Impairment charge	(510.0)	$ 0.0
Foreign currency translation	(8.0)
Goodwill	181.1
Driveline [Member]
Goodwill [Roll Forward]
Goodwill	398.3
Impairment charge	(210.8)
Foreign currency translation	(6.4)
Goodwill	181.1
Metal Forming [Member]
Goodwill [Roll Forward]
Goodwill	300.8
Impairment charge	(299.2)
Foreign currency translation	(1.6)
Goodwill	$ 0.0

X

- Definition

Amount after accumulated impairment loss of 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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X

- Definition

Amount of loss from the write-down of an asset representing the 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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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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