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Financial Instruments - Marketable Equity Securities (Details) - Marketable Equity Securities - USD ($)
$ in Millions
Mar. 30, 2019
Dec. 31, 2018
Debt and Equity Securities, FV-NI [Line Items]    
Current assets $ 13.8 $ 4.8
Other long-term assets 37.3 42.5
Marketable equity securities $ 51.1 $ 47.3