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Restructuring Reserve Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 31.8	$ 23.5
Minimum [Member] | Forecast [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost			$ 70.0
Maximum [Member] | Forecast [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost			$ 80.0
Driveline [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	14.4	2.0
Metal Forming [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	13.1	14.4
Casting [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges		0.7
2020 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	22.9
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	19.9	10.4
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 11.9	$ 13.1

X

- Definition

Amount expected to be recognized in earnings for the specified restructuring cost.

+ References

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-Publisher FASB
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+ References

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