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Segment Reporting Sales and Segment Adjusted EBITDA (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Net, Inclusive of Intersegment Sales	$ 1,900.0	$ 1,110.9	$ 3,049.3	$ 2,161.5
Sales Revenue, Goods, Net, Intersegment Sales	142.2	85.5	241.6	166.9
Net sales	1,757.8	1,025.4	2,807.7	1,994.6
Segment Adjusted EBITDA	325.7	164.8	509.3	314.6
Driveline [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Net, Inclusive of Intersegment Sales	1,021.5	969.5	2,020.8	1,884.3
Sales Revenue, Goods, Net, Intersegment Sales	0.4	1.9	0.9	3.7
Net sales	1,021.1	967.6	2,019.9	1,880.6
Segment Adjusted EBITDA	178.9	135.7	332.1	257.5
Metal Forming [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Net, Inclusive of Intersegment Sales	369.3	141.4	519.3	277.2
Sales Revenue, Goods, Net, Intersegment Sales	109.4	83.6	208.3	163.2
Net sales	259.9	57.8	311.0	114.0
Segment Adjusted EBITDA	69.4	29.1	99.8	57.1
Powertrain [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Net, Inclusive of Intersegment Sales	283.6	0.0	283.6	0.0
Sales Revenue, Goods, Net, Intersegment Sales	2.2	0.0	2.2	0.0
Net sales	281.4	0.0	281.4	0.0
Segment Adjusted EBITDA	51.9	0.0	51.9	0.0
Casting [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Net, Inclusive of Intersegment Sales	225.6	0.0	225.6	0.0
Sales Revenue, Goods, Net, Intersegment Sales	30.2	0.0	30.2	0.0
Net sales	195.4	0.0	195.4	0.0
Segment Adjusted EBITDA	$ 25.5	$ 0.0	$ 25.5	$ 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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- Definition

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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