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Financial Instruments - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
Sep. 28, 2019
Dec. 31, 2018
Sep. 29, 2018
Dec. 31, 2017
Fair Value Disclosures [Abstract]        
Balance sheet - cash and cash equivalents $ 1,300.9 [1] $ 1,493.2 $ 1,198.6  
Restricted cash included in other current assets 15.6   8.5  
Restricted cash included in other long-term assets 6.8   17.8  
Statement of cash flows - cash, cash equivalents and restricted cash $ 1,323.3 $ 1,519.8 $ 1,224.9 $ 1,500.4
[1]
Unaudited.