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Financial Instruments - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
Mar. 30, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Fair Value Disclosures [Abstract]        
Balance sheet - cash and cash equivalents $ 1,199.4 [1] $ 1,493.2 $ 1,268.5  
Restricted cash included in other current assets 13.9   8.4  
Restricted cash included in other long-term assets 7.6   17.6  
Statement of cash flows - cash, cash equivalents and restricted cash $ 1,220.9 $ 1,519.8 $ 1,294.5 $ 1,500.4
[1] Unaudited.