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Total Assets by Segment (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total assets	$ 8,058.3	$ 3,423.9
Driveline [Member]
Segment Reporting Information [Line Items]
Total assets	2,362.7	2,183.9
Metal Forming [Member]
Segment Reporting Information [Line Items]
Total assets	2,155.8	410.3
Powertrain [Member]
Segment Reporting Information [Line Items]
Total assets	1,825.1	0.0
Casting [Member]
Segment Reporting Information [Line Items]
Total assets	1,018.0	0.0
Other Segments [Member]
Segment Reporting Information [Line Items]
Total assets	$ 696.7	$ 829.7

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

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+ References

No definition available.

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