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Segment Assets (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Assets | $ 7,316.3 | $ 7,510.7
Driveline [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 3,649.4 | 3,529.2
Metal Forming [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 2,579.9 | 2,723.0
Casting [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 454.7 | 664.7
Corporate and Eliminations [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | $ 632.3 | $ 593.8

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