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Intangible Assets Table (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Gross $ 1,292.8   $ 1,292.8   $ 1,296.3
Finite-Lived Intangible Assets, Accumulated Amortization (157.6)   (157.6)   (83.8)
Finite-Lived Intangible Assets, Net 1,135.2   1,135.2   1,212.5
Amortization of Intangible Assets 24.8 $ 24.4 74.5 $ 50.8  
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 100.0   100.0    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 100.0   100.0    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 100.0   100.0    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 100.0   100.0    
Finite-Lived Intangible Assets, Amortization Expense, Year Five 100.0   100.0    
Powertrain [Member]          
Finite-Lived Intangible Assets [Line Items]          
Indefinite-lived Intangible Assets, Written off Related to Sale of Business Unit     4.8    
Intangible Assets, Written off Related to Sale of Business Unit, Accumulated Amortization     0.3    
Computer Software, Intangible Asset [Member]          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Gross 37.4   37.4   35.6
Finite-Lived Intangible Assets, Accumulated Amortization (18.6)   (18.6)   (14.3)
Finite-Lived Intangible Assets, Net 18.8   18.8   21.3
In Process Research and Development [Member]          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Gross 5.4   5.4   5.9
Finite-Lived Intangible Assets, Accumulated Amortization (0.6)   (0.6)   0.0
Finite-Lived Intangible Assets, Net 4.8   4.8   5.9
Customer Platforms - Intangible Assets [Member]          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Gross 952.2   952.2   952.2
Finite-Lived Intangible Assets, Accumulated Amortization (105.8)   (105.8)   (52.9)
Finite-Lived Intangible Assets, Net 846.4   846.4   899.3
Customer Relationships - Intangible Assets [Member]          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Gross 147.0   147.0   151.8
Finite-Lived Intangible Assets, Accumulated Amortization (14.2)   (14.2)   (7.3)
Finite-Lived Intangible Assets, Net 132.8   132.8   144.5
Technology-Based Intangible Assets [Member]          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Gross 150.8   150.8   150.8
Finite-Lived Intangible Assets, Accumulated Amortization (18.4)   (18.4)   (9.3)
Finite-Lived Intangible Assets, Net $ 132.4   $ 132.4   $ 141.5