Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 29, 2020		Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	$ 1,815,705	[1]	$ 1,772,278
Other comprehensive income/(loss)	(93,987)		6,048
Ending Balance	1,755,441		1,801,139
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(241,994)		(251,102)
Other comprehensive income/(loss) before reclassifications	(93,575)		(2,852)
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax	0
Other comprehensive income/(loss)	(93,575)		(2,852)
Ending Balance	(335,569)		(253,954)
Foreign Currency Items | Fixed Assets
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax			0
Foreign Currency Items | Net Income
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax			0
Defined Benefit Pension Items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(574,413)		(487,380)
Other comprehensive income/(loss) before reclassifications	197		(508)
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax	5,583
Other comprehensive income/(loss)	5,780		7,156
Ending Balance	(568,633)		(480,224)
Defined Benefit Pension Items | Fixed Assets
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax			0
Defined Benefit Pension Items | Net Income
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax			7,664
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(396)		(2,431)
Other comprehensive income/(loss) before reclassifications	(5,620)		2,256
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax	1,065
Other comprehensive income/(loss)	(4,555)		1,864
Ending Balance	(4,951)		(567)
Cash Flow Hedges | Fixed Assets
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax			(45)
Cash Flow Hedges | Net Income
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax			(347)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(816,803)		(740,913)
Other comprehensive income/(loss) before reclassifications	(98,998)		(1,104)
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax	6,648
Other comprehensive income/(loss)	(92,350)		6,168
Ending Balance	$ (909,153)		(734,745)
Accumulated Other Comprehensive Loss | Fixed Assets
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax			(45)
Accumulated Other Comprehensive Loss | Net Income
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax			$ 7,317

[1] The year-end condensed consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America.