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Financial Instruments - Marketable Equity Securities (Details) - Marketable Equity Securities - USD ($)
$ in Millions
Sep. 28, 2019
Dec. 31, 2018
Debt and Equity Securities, FV-NI [Line Items]    
Current assets $ 16.1 $ 4.8
Other long-term assets 39.5 42.5
Marketable equity securities $ 55.6 $ 47.3