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Financial Instruments - Notional Amount, Estimated Aggregate Fair Value and Related Balance Sheet Classification of Foreign Currency Derivative Contracts (Details) - Foreign currency contracts - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 29, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]    
Total fair value $ 42.4 $ (22.8)
Notional amount 2,494.3 2,219.6
Designated as hedging instrument | Cash flow hedge    
Derivatives, Fair Value [Line Items]    
Other current assets 33.4 16.9
Other long-term assets 6.7 1.3
Other current liabilities (3.4) (28.4)
Other long-term liabilities (0.2) (8.0)
Total fair value 36.5 (18.2)
Notional amount $ 1,281.3 $ 1,538.5
Designated as hedging instrument | Cash flow hedge | Maximum    
Derivatives, Fair Value [Line Items]    
Outstanding maturities in months, not to exceed 24 months 24 months
Not designated as hedging instrument    
Derivatives, Fair Value [Line Items]    
Other current assets $ 8.0 $ 1.8
Other current liabilities (2.1) (6.4)
Fair value of foreign currency contracts not designated as hedging instruments 5.9 (4.6)
Notional amount $ 1,213.0 $ 681.1
Not designated as hedging instrument | Maximum    
Derivatives, Fair Value [Line Items]    
Outstanding maturities in months, not to exceed 12 months 12 months