Restructuring and Acquisition-Related Costs - Restructuring Reserve Narrative (Details) - USD ($) $ in Millions	12 Months Ended			24 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2021
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 43.2	$ 58.4	$ 39.8
Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining	20.0			$ 20.0
Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining	30.0			30.0
Driveline [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	4.7	19.3	6.4
Metal Forming [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	6.5	16.0	21.5
Casting [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			0.7
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2.9	22.3	19.4
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	40.3	$ 36.1	$ 20.4
2020 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	39.5			$ 87.3
Emporium, Pennsylvania [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 3.7