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Revenue from Contracts with Customers Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 1,858.4 | $ 1,049.9
North America [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 1,510.6 | 916.3
Asia [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 155.3 | 85.5
Europe [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 158.3 | 20.7
South America [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 34.2 | 27.4
Driveline [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 1,070.4 | 998.8
Driveline [Member] | North America [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 885.3 | 865.2
Driveline [Member] | Asia [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 122.8 | 85.5
Driveline [Member] | Europe [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 29.0 | 20.7
Driveline [Member] | South America [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 33.3 | 27.4
Metal Forming [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 291.1 | 51.1
Metal Forming [Member] | North America [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 216.3 | 51.1
Metal Forming [Member] | Asia [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 1.4 | 0.0
Metal Forming [Member] | Europe [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 73.4 | 0.0
Metal Forming [Member] | South America [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0.0 | 0.0
Powertrain [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 287.1 | 0.0
Powertrain [Member] | North America [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 199.2 | 0.0
Powertrain [Member] | Asia [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 31.1 | 0.0
Powertrain [Member] | Europe [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 55.9 | 0.0
Powertrain [Member] | South America [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0.9 | 0.0
Casting [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 209.8 | 0.0
Casting [Member] | North America [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 209.8 | 0.0
Casting [Member] | Asia [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0.0 | 0.0
Casting [Member] | Europe [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0.0 | 0.0
Casting [Member] | South America [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 0.0 | $ 0.0

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