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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
3 Months Ended 12 Months Ended
Mar. 30, 2019
Dec. 31, 2018
Derivatives, Fair Value [Line Items]    
Total fair value $ 27.4 $ 14.3
Notional amount 2,678.6 2,153.0
Designated as hedging instrument | Cash flow hedge    
Derivatives, Fair Value [Line Items]    
Other current assets 28.0 20.6
Other long-term assets 4.2 2.8
Other current liabilities (3.0) (8.4)
Other long-term liabilities (0.6) (2.0)
Total fair value 28.6 13.0
Notional amount $ 1,357.2 $ 1,499.0
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 $ 6.5 $ 6.1
Other current liabilities (7.7) (4.8)
Total fair value (1.2) 1.3
Notional amount $ 1,321.4 $ 654.0
Not designated as hedging instrument | Maximum    
Derivatives, Fair Value [Line Items]    
Outstanding maturities in months, not to exceed 9 months 12 months