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Restructuring Reserve Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 24.0	$ 17.1
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	9.9	1.5
Metal Forming [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	10.4	9.8
Casting [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges		0.7
2020 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	16.2
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	16.3	8.2
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 7.7	$ 8.9

X

- Definition

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

+ References

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