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Sales and Segment Adjusted EBITDA (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Sales	$ 1,515.4	$ 1,428.0
Less: intersegment sales	90.3	84.5
Net external sales	1,425.1	1,343.5
Segment Adjusted EBITDA	262.9	213.3
Driveline [Member]
Segment Reporting Information [Line Items]
Sales	1,026.1	945.9
Less: intersegment sales	1.1	0.1
Net external sales	1,025.0	945.8
Segment Adjusted EBITDA	170.5	134.5
Metal Forming [Member]
Segment Reporting Information [Line Items]
Sales	489.3	482.1
Less: intersegment sales	89.2	84.4
Net external sales	400.1	397.7
Segment Adjusted EBITDA	$ 92.4	$ 78.8

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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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