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Segment Reporting Sales and Segment Adjusted EBITDA (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Net, Inclusive of Intersegment Sales	$ 1,998.5	$ 1,149.3
Sales Revenue, Goods, Net, Intersegment Sales	140.1	99.4
Net sales	1,858.4	1,049.9
Total Segment Adjusted EBITDA	317.0	183.6
Driveline [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Net, Inclusive of Intersegment Sales	1,070.6	999.3
Sales Revenue, Goods, Net, Intersegment Sales	0.2	0.5
Net sales	1,070.4	998.8
Total Segment Adjusted EBITDA	170.0	153.2
Metal Forming [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Net, Inclusive of Intersegment Sales	397.0	150.0
Sales Revenue, Goods, Net, Intersegment Sales	105.9	98.9
Net sales	291.1	51.1
Total Segment Adjusted EBITDA	75.3	30.4
Powertrain [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Net, Inclusive of Intersegment Sales	291.9	0.0
Sales Revenue, Goods, Net, Intersegment Sales	4.8	0.0
Net sales	287.1	0.0
Total Segment Adjusted EBITDA	50.1	0.0
Casting [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Net, Inclusive of Intersegment Sales	239.0	0.0
Sales Revenue, Goods, Net, Intersegment Sales	29.2	0.0
Net sales	209.8	0.0
Total Segment Adjusted EBITDA	$ 21.6	$ 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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- Definition

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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