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Derivative Financial Instruments - Narrative (Details)
£ in Millions, $ in Millions
9 Months Ended
Jun. 29, 2018
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2018
GBP (£)
Net Investment | Facility and 2015 Term Loan      
Derivative [Line Items]      
Borrowings designated as hedge of net investment | £     £ 55
Interest-rate swap contracts | Maximum      
Derivative [Line Items]      
Estimate change in fair value of derivative for assumption of one percentage point change in the interest rate   $ 1  
Cross currency swap      
Derivative [Line Items]      
Loss on cross currency swap contract termination $ 6