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Financial Instruments - Interest Rate Risk (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2018
Apr. 02, 2017
Dec. 31, 2017
Derivatives Not Designated as Hedging Instruments | Foreign Exchange Forward      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Foreign currency forward-exchange contracts $ 10.0 $ 29.0  
Derivatives Designated as Hedging Instruments: | Interest rate swaps      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Loss on Contract Termination     $ 3.0
Loss on Cash Flow Hedge Ineffectiveness     $ 0.1