Sales and Segment Adjusted EBITDA (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Net, Inclusive of Intersegment Sales	$ 1,846.0	$ 2,047.9	$ 3,689.3	$ 4,045.3
Sales Revenue, Goods, Net, Intersegment Sales	141.7	147.0	265.8	286.0
Revenues	1,704.3	1,900.9	3,423.5	3,759.3
Total Segment Adjusted EBITDA	266.0	347.9	511.0	664.9
Driveline [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Net, Inclusive of Intersegment Sales	1,141.1	1,274.3	2,275.8	2,490.4
Sales Revenue, Goods, Net, Intersegment Sales	1.1	1.7	2.0	3.5
Revenues	1,140.0	1,272.6	2,273.8	2,486.9
Total Segment Adjusted EBITDA	152.9	204.3	290.1	394.0
Metal Forming [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Net, Inclusive of Intersegment Sales	484.2	530.4	967.5	1,072.7
Sales Revenue, Goods, Net, Intersegment Sales	106.8	111.8	202.0	219.8
Revenues	377.4	418.6	765.5	852.9
Total Segment Adjusted EBITDA	88.0	116.7	173.3	222.4
Casting [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Net, Inclusive of Intersegment Sales	220.7	243.2	446.0	482.2
Sales Revenue, Goods, Net, Intersegment Sales	33.8	33.5	61.8	62.7
Revenues	186.9	209.7	384.2	419.5
Total Segment Adjusted EBITDA	$ 25.1	$ 26.9	$ 47.6	$ 48.5