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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