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Organization and Basis of Presentation Property, Plant, & Equipment (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Depreciation and tooling amortization $ 301.6 $ 160.4 $ 163.6
Noncash or part noncash acquisition, fixed assets acquired $ 103.0 $ 19.0 $ 43.6