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Goodwill and Intangible Assets - Goodwill Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill [Line Items]      
Goodwill, Impairment Loss $ 510.0 $ 440.0  
Goodwill, Impaired, Facts and Circumstances Leading to Impairment These impairment charges were primarily the result of a decline in the projected cash flows of these reporting units under our revised long-range plan completed in the first quarter of 2020. The revision to our long-range plan was driven by lower forecasted sales volumes in the internal and external data sources used to form our projections primarily due to the reduction in global automotive production volumes caused by the impact of COVID-19. The impairment charges were also the result of changes in certain market-related inputs to the analysis to reflect macro-economic changes caused by the impact of COVID-19, including increased discount rates and lower pricing multiples for comparable public companies. This impairment was primarily the result of a decline in the projected cash flows of this reporting unit under our long-range plan completed in the fourth quarter of 2019, as compared to the long-range plan completed in the fourth quarter of 2018. This was driven, in part, by lower forecasted sales volumes in the internal and external data sources used to form our projections. These impairments were primarily the result of a general contraction of pricing multiples associated with capital intensive businesses such as the business conducted by our former Casting and Powertrain reporting units, as well as a decline in the projected cash flows of these reporting units under our long-range plan completed in the fourth quarter of 2018, as compared to the long-range plan completed in the fourth quarter of 2017.
Goodwill, Impaired, Accumulated Impairment Loss $ 1,435.5    
Driveline [Member]      
Goodwill [Line Items]      
Goodwill, Impairment Loss 210.8 $ 0.0  
Metal Forming [Member]      
Goodwill [Line Items]      
Goodwill, Impairment Loss 299.2 440.0  
Casting [Member]      
Goodwill [Line Items]      
Goodwill, Impairment Loss     $ 405.5
Powertrain [Member]      
Goodwill [Line Items]      
Goodwill, Impairment Loss $ 0.0 $ 0.0 $ 80.0