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Revenue from Contracts with Customers Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disaggregation of Revenue [Line Items]        
Revenue, Performance Obligation, Description of Payment Terms     50 days  
Net sales $ 1,900.9 $ 1,757.8 $ 3,759.3 $ 2,807.7
North America [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 1,522.1 1,463.2 3,032.7 2,379.5
Asia [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 190.4 137.1 345.7 222.6
Europe [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 155.9 123.4 314.2 144.1
South America [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 32.5 34.1 66.7 61.5
Driveline [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 1,120.0 1,021.1 2,190.4 2,019.9
Driveline [Member] | North America [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 899.0 862.0 1,784.3 1,727.2
Driveline [Member] | Asia [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 159.3 103.9 282.1 189.4
Driveline [Member] | Europe [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 30.7 21.2 59.7 41.9
Driveline [Member] | South America [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 31.0 34.0 64.3 61.4
Metal Forming [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 287.8 259.9 578.9 311.0
Metal Forming [Member] | North America [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 216.3 201.6 432.6 252.7
Metal Forming [Member] | Asia [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 1.2 0.7 2.6 0.7
Metal Forming [Member] | Europe [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 70.3 57.6 143.7 57.6
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 283.5 281.4 570.6 281.4
Powertrain [Member] | North America [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 197.2 204.2 396.4 204.2
Powertrain [Member] | Asia [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 29.9 32.5 61.0 32.5
Powertrain [Member] | Europe [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 54.9 44.6 110.8 44.6
Powertrain [Member] | South America [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 1.5 0.1 2.4 0.1
Casting [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 209.6 195.4 419.4 195.4
Casting [Member] | North America [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 209.6 195.4 419.4 195.4
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