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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

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