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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