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Revenue from Contracts with Customers Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Performance Obligation, Description of Payment Terms |  |  | 50 days |
Net sales | $ 1,817.0 | $ 1,724.4 | $ 5,576.3 | $ 4,532.1
North America [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 1,456.6 | 1,405.4 | 4,489.3 | 3,784.9
Asia [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 169.6 | 146.4 | 515.3 | 369.0
Europe [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 154.9 | 136.0 | 469.1 | 280.1
South America [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 35.9 | 36.6 | 102.6 | 98.1
Driveline [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 1,067.7 | 1,007.7 | 3,258.1 | 3,027.6
Driveline [Member] | North America [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 855.9 | 832.4 | 2,640.2 | 2,559.6
Driveline [Member] | Asia [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 142.9 | 112.3 | 425.0 | 301.7
Driveline [Member] | Europe [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 34.3 | 26.6 | 94.0 | 68.5
Driveline [Member] | South America [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 34.6 | 36.4 | 98.9 | 97.8
Metal Forming [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 273.4 | 261.4 | 852.3 | 572.4
Metal Forming [Member] | North America [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 207.2 | 197.8 | 639.8 | 450.5
Metal Forming [Member] | Asia [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 1.6 | 1.4 | 4.2 | 2.1
Metal Forming [Member] | Europe [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 64.6 | 62.2 | 208.3 | 119.8
Metal Forming [Member] | South America [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Powertrain [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 282.1 | 257.1 | 852.7 | 538.5
Powertrain [Member] | North America [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 199.7 | 177.0 | 596.1 | 381.2
Powertrain [Member] | Asia [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 25.1 | 32.7 | 86.1 | 65.2
Powertrain [Member] | Europe [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 56.0 | 47.2 | 166.8 | 91.8
Powertrain [Member] | South America [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 1.3 | 0.2 | 3.7 | 0.3
Casting [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 193.8 | 198.2 | 613.2 | 393.6
Casting [Member] | North America [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 193.8 | 198.2 | 613.2 | 393.6
Casting [Member] | Asia [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Casting [Member] | Europe [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Casting [Member] | South America [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0

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