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Pre-Production Costs Related to Long-Term Supply Agreements - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 29, 2019
Jun. 30, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Pre-production E&D costs for which reimbursement is contractually guaranteed by the customer $ 125.8 $ 67.8
Pre-production tooling costs related to customer-owned tools for which reimbursement is contractually guaranteed by the customer 91.3 100.3
Cash collected related to E&D and tooling costs $ 163.7 $ 165.4