Sales and Segment Adjusted EBITDA (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Sales	$ 1,832.3	$ 1,956.3	$ 5,521.6	$ 6,001.6
Intersegment sales	154.9	139.3	420.7	425.3
Net sales	1,677.4	1,817.0	5,100.9	5,576.3
Segment Adjusted EBITDA	265.8	275.0	776.8	939.9
Driveline [Member]
Segment Reporting Information [Line Items]
Sales	1,146.7	1,228.2	3,422.5	3,718.6
Intersegment sales	8.6	1.8	10.6	5.3
Net sales	1,138.1	1,226.4	3,411.9	3,713.3
Segment Adjusted EBITDA	171.6	176.9	461.7	570.9
Metal Forming [Member]
Segment Reporting Information [Line Items]
Sales	476.6	509.0	1,444.1	1,581.7
Intersegment sales	107.0	112.2	309.0	331.9
Net sales	369.6	396.8	1,135.1	1,249.8
Segment Adjusted EBITDA	80.4	83.6	253.7	306.0
Casting [Member]
Segment Reporting Information [Line Items]
Sales	209.0	219.1	655.0	701.3
Intersegment sales	39.3	25.3	101.1	88.1
Net sales	169.7	193.8	553.9	613.2
Segment Adjusted EBITDA	$ 13.8	$ 14.5	$ 61.4	$ 63.0