Sales and Segment Adjusted EBITDA (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Sales	$ 1,375.5	$ 544.1	$ 2,890.9	$ 1,972.1
Less: intersegment sales	92.2	28.8	182.5	113.3
Net external sales	1,283.3	515.3	2,708.4	1,858.8
Segment Adjusted EBITDA	222.6	(52.1)	485.5	161.2
Driveline [Member]
Segment Reporting Information [Line Items]
Sales	935.4	375.9	1,961.5	1,321.8
Less: intersegment sales	0.5	0.1	1.6	0.2
Net external sales	934.9	375.8	1,959.9	1,321.6
Segment Adjusted EBITDA	151.3	(25.0)	321.8	109.5
Metal Forming [Member]
Segment Reporting Information [Line Items]
Sales	440.1	168.2	929.4	650.3
Less: intersegment sales	91.7	28.7	180.9	113.1
Net external sales	348.4	139.5	748.5	537.2
Segment Adjusted EBITDA	$ 71.3	$ (27.1)	$ 163.7	$ 51.7