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Financial Instruments - Marketable Equity Securities (Details) - Marketable Equity Securities - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Debt and Equity Securities, FV-NI [Line Items]    
Current assets $ 3.6 $ 3.2
Other long-term assets 43.9 40.6
Marketable equity securities $ 47.5 $ 43.8