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Financial Instruments - Estimated Aggregate Fair Value and Carrying Value of Debt Instruments (Details) - USD ($)
$ in Millions
Sep. 29, 2018
Dec. 31, 2017
Fair Value Disclosures [Abstract]    
Estimated aggregate fair value $ 1,947.2 $ 2,033.5
Aggregate carrying value $ 1,968.8 $ 1,973.4