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Segment Reporting Sales and Segment Adjusted EBITDA (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Net, Inclusive of Intersegment Sales	$ 1,863.6	$ 1,093.3	$ 4,912.9	$ 3,254.8
Sales Revenue, Goods, Net, Intersegment Sales	139.2	86.4	380.8	253.3
Net sales	1,724.4	1,006.9	4,532.1	3,001.5
Segment Adjusted EBITDA	297.7	156.7	807.0	471.3
Driveline [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Net, Inclusive of Intersegment Sales	1,007.9	956.1	3,028.7	2,840.4
Sales Revenue, Goods, Net, Intersegment Sales	0.2	0.1	1.1	3.8
Net sales	1,007.7	956.0	3,027.6	2,836.6
Segment Adjusted EBITDA	181.4	134.4	513.5	391.9
Metal Forming [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Net, Inclusive of Intersegment Sales	368.2	137.2	887.5	414.4
Sales Revenue, Goods, Net, Intersegment Sales	106.8	86.3	315.1	249.5
Net sales	261.4	50.9	572.4	164.9
Segment Adjusted EBITDA	70.7	22.3	170.5	79.4
Powertrain [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Net, Inclusive of Intersegment Sales	260.9	0.0	544.5	0.0
Sales Revenue, Goods, Net, Intersegment Sales	3.8	0.0	6.0	0.0
Net sales	257.1	0.0	538.5	0.0
Segment Adjusted EBITDA	36.8	0.0	88.7	0.0
Casting [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Net, Inclusive of Intersegment Sales	226.6	0.0	452.2	0.0
Sales Revenue, Goods, Net, Intersegment Sales	28.4	0.0	58.6	0.0
Net sales	198.2	0.0	393.6	0.0
Segment Adjusted EBITDA	$ 8.8	$ 0.0	$ 34.3	$ 0.0

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- Definition

Sales Revenue, Goods, Net, Inclusive of Intersegment Sales

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Sales Revenue, Goods, Net, Intersegment Sales. Sales between operating segments.

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Segment Adjusted EBITDA is defined as earnings before interest, income taxes, depreciation and amortization for our reportable segments, excluding the impact of restructuring and acquisition-related costs, debt refinancing and redemption costs and non-recurring items

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Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(a))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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