Restructuring Reserve Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 14.7	$ 8.4
Minimum [Member] \| Forecast [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost			$ 45.0
Maximum [Member] \| Forecast [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost			$ 55.0
Driveline [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	6.8	0.4
Metal Forming [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	5.2	4.8
2020 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	8.7
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	2.2	4.1
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	12.5	$ 4.3
Contractual Wage and Benefit Continuation Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 6.5