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Sales and Segment Adjusted EBITDA (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Sales	$ 1,454.0	$ 1,843.3
Intersegment sales	110.5	124.1
Net external sales	1,343.5	1,719.2
Segment Adjusted EBITDA	213.3	245.0
Driveline [Member]
Segment Reporting Information [Line Items]
Sales	1,031.7	1,166.3
Intersegment sales	19.7	17.6
Net external sales	1,012.0	1,148.7
Segment Adjusted EBITDA	139.3	142.8
Metal Forming [Member]
Segment Reporting Information [Line Items]
Sales	422.3	483.3
Intersegment sales	90.8	95.2
Net external sales	331.5	388.1
Segment Adjusted EBITDA	74.0	84.4
Casting [Member]
Segment Reporting Information [Line Items]
Sales	0.0	193.7
Intersegment sales	0.0	11.3
Net external sales	0.0	182.4
Segment Adjusted EBITDA	$ 0.0	$ 17.8

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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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