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Sales and Segment Adjusted EBITDA (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Sales	$ 1,527.7	$ 1,831.8	$ 3,535.7	$ 5,520.3
Intersegment sales	113.6	154.4	262.8	419.4
Net external sales	1,414.1	1,677.4	3,272.9	5,100.9
Segment Adjusted EBITDA	297.1	265.8	458.3	776.8
Driveline [Member]
Segment Reporting Information [Line Items]
Sales	1,094.5	1,186.8	2,529.9	3,534.6
Intersegment sales	0.6	34.4	27.5	77.9
Net external sales	1,093.9	1,152.4	2,502.4	3,456.7
Segment Adjusted EBITDA	207.4	181.0	315.5	485.9
Metal Forming [Member]
Segment Reporting Information [Line Items]
Sales	433.2	476.6	1,005.8	1,444.1
Intersegment sales	113.0	107.0	235.3	309.0
Net external sales	320.2	369.6	770.5	1,135.1
Segment Adjusted EBITDA	89.7	79.3	142.8	250.2
Casting [Member]
Segment Reporting Information [Line Items]
Sales	0.0	168.4	0.0	541.6
Intersegment sales	0.0	13.0	0.0	32.5
Net external sales	0.0	155.4	0.0	509.1
Segment Adjusted EBITDA	$ 0.0	$ 5.5	$ 0.0	$ 40.7

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Sales Revenue, Goods, Net, Inclusive of Intersegment Sales

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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