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Pre-Production Costs Related to Long-Term Supply Agreements - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Jul. 04, 2020
Jun. 29, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Pre-production E&D costs for which reimbursement is contractually guaranteed by the customer $ 91.8 $ 125.8
Pre-production tooling costs related to customer-owned tools for which reimbursement is contractually guaranteed by the customer 90.0 91.3
Cash collected related to E&D and tooling costs $ 127.8 $ 163.7