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Property, Plant, & Equipment (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Depreciation and tooling amortization $ 367.0 $ 301.6 $ 160.4
Noncash or part noncash acquisition, fixed assets acquired $ 84.1 $ 103.0 $ 19.0