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Debt Debt (Senior Notes Due 2026) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 29, 2018 USD ($)	Sep. 30, 2017 USD ($)	May 02, 2018 EUR (€)	Jun. 03, 2015 EUR (€)
Debt Instrument [Line Items]
Debt extinguishment costs | $	$ 0	$ 0	$ 23,509	$ 0
Senior Notes [Member] | Senior Notes 3.625% Due 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount | €					€ 515,000,000
Stated interest rate	3.625%		3.625%		3.625%
Debt Issuance costs | $	$ 8,800		$ 8,800
Senior Notes [Member] | Senior Notes 4.75% Due 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount | €						€ 515,000,000.0
Stated interest rate	4.75%		4.75%			4.75%

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- Definition

Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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