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Pre-Production Costs Related to Long-Term Supply Agreements (Tables)
 3 Months Ended
Mar. 30, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Classification of Recoverable Customer E&D and Tooling Costs Related to Long-term Supply Agreements The classification of recoverable customer E&D and tooling costs related to long-term supply agreements is shown below (in millions):
 
March 30,
2019
 
December 31, 2018
Current
$
174.6

 
$
160.9

Long-term
80.7

 
80.4

Recoverable customer E&D and tooling
$
255.3

 
$
241.3