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Financial Instruments - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
Sep. 29, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Fair Value Disclosures [Abstract]        
Balance sheet - cash and cash equivalents $ 1,198.6 [1] $ 1,500.4 $ 1,253.7  
Restricted cash included in other current assets 8.5   0.0  
Restricted cash included in other long-term assets 17.8   0.0  
Statement of cash flows - cash, cash equivalents and restricted cash $ 1,224.9 $ 1,500.4 $ 1,253.7 $ 1,271.6
[1] Unaudited.