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Segment Reporting Sales and Segment Adjusted EBITDA (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Segment Reporting Information [Line Items]    
Sales Revenue, Goods, Net, Inclusive of Intersegment Sales $ 1,843.3 $ 1,997.4
Sales Revenue, Goods, Net, Intersegment Sales 124.1 139.0
Revenues 1,719.2 1,858.4
Total Segment Adjusted EBITDA 245.0 317.0
Driveline [Member]    
Segment Reporting Information [Line Items]    
Sales Revenue, Goods, Net, Inclusive of Intersegment Sales 1,134.7 1,216.1
Sales Revenue, Goods, Net, Intersegment Sales 0.9 1.8
Revenues 1,133.8 1,214.3
Total Segment Adjusted EBITDA 137.2 189.7
Metal Forming [Member]    
Segment Reporting Information [Line Items]    
Sales Revenue, Goods, Net, Inclusive of Intersegment Sales 483.3 542.3
Sales Revenue, Goods, Net, Intersegment Sales 95.2 108.0
Revenues 388.1 434.3
Total Segment Adjusted EBITDA 85.3 105.7
Casting [Member]    
Segment Reporting Information [Line Items]    
Sales Revenue, Goods, Net, Inclusive of Intersegment Sales 225.3 239.0
Sales Revenue, Goods, Net, Intersegment Sales 28.0 29.2
Revenues 197.3 209.8
Total Segment Adjusted EBITDA $ 22.5 $ 21.6