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Disaggregation of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disaggregation of Revenue [Line Items] |  |  |
Net sales | $ 7,270.4 | $ 6,266.0 | $ 3,948.0
North America [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 5,840.3 | 5,198.8 | 3,500.4
Asia [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 678.3 | 512.5 | 265.9
Europe [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 622.1 | 421.5 | 83.5
South America [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 129.7 | 133.2 | 98.2
Driveline [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 4,254.0 | 4,039.7 | 3,730.7
Driveline [Member] | North America [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 3,435.4 | 3,400.2 | 3,283.1
Driveline [Member] | Asia [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 557.8 | 409.4 | 265.9
Driveline [Member] | Europe [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 135.9 | 97.4 | 83.5
Driveline [Member] | South America [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 124.9 | 132.7 | 98.2
Metal Forming [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 1,097.4 | 830.0 | 217.3
Metal Forming [Member] | North America [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 824.9 | 644.2 | 217.3
Metal Forming [Member] | Asia [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 6.0 | 3.3 | 0.0
Metal Forming [Member] | Europe [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 266.5 | 182.5 | 0.0
Metal Forming [Member] | South America [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Powertrain [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 1,114.7 | 806.6 | 0.0
Powertrain [Member] | North America [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 775.7 | 564.7 | 0.0
Powertrain [Member] | Asia [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 114.5 | 99.8 | 0.0
Powertrain [Member] | Europe [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 219.7 | 141.6 | 0.0
Powertrain [Member] | South America [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 4.8 | 0.5 | 0.0
Casting [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 804.3 | 589.7 | 0.0
Casting [Member] | North America [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 804.3 | 589.7 | 0.0
Casting [Member] | Asia [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Casting [Member] | Europe [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Casting [Member] | South America [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | $ 0.0 | $ 0.0 | $ 0.0

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