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Revenue from Contracts with Customers Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disaggregation of Revenue [Line Items]    
Net sales $ 1,719.2 $ 1,858.4
North America [Member]    
Disaggregation of Revenue [Line Items]    
Net sales 1,355.8 1,510.6
Asia [Member]    
Disaggregation of Revenue [Line Items]    
Net sales 160.8 155.3
Europe [Member]    
Disaggregation of Revenue [Line Items]    
Net sales 174.3 158.3
South America [Member]    
Disaggregation of Revenue [Line Items]    
Net sales 28.3 34.2
Driveline [Member]    
Disaggregation of Revenue [Line Items]    
Net sales 1,133.8 1,214.3
Driveline [Member] | North America [Member]    
Disaggregation of Revenue [Line Items]    
Net sales 853.1 961.2
Driveline [Member] | Asia [Member]    
Disaggregation of Revenue [Line Items]    
Net sales 153.3 143.0
Driveline [Member] | Europe [Member]    
Disaggregation of Revenue [Line Items]    
Net sales 101.6 76.8
Driveline [Member] | South America [Member]    
Disaggregation of Revenue [Line Items]    
Net sales 25.8 33.3
Metal Forming [Member]    
Disaggregation of Revenue [Line Items]    
Net sales 388.1 434.3
Metal Forming [Member] | North America [Member]    
Disaggregation of Revenue [Line Items]    
Net sales 305.4 339.6
Metal Forming [Member] | Asia [Member]    
Disaggregation of Revenue [Line Items]    
Net sales 7.5 12.3
Metal Forming [Member] | Europe [Member]    
Disaggregation of Revenue [Line Items]    
Net sales 72.7 81.5
Metal Forming [Member] | South America [Member]    
Disaggregation of Revenue [Line Items]    
Net sales 2.5 0.9
Casting [Member]    
Disaggregation of Revenue [Line Items]    
Net sales 197.3 209.8
Casting [Member] | North America [Member]    
Disaggregation of Revenue [Line Items]    
Net sales 197.3 209.8
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