Quarterly Financial Data Quarterly Financial Information Table (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2018		Sep. 29, 2018		Jun. 30, 2018		Mar. 31, 2018		Dec. 31, 2017		Sep. 30, 2017		Jul. 01, 2017		Apr. 01, 2017		Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Effect of Fourth Quarter Events [Line Items]
Sales	$ 7,918,182		$ 7,490,445		$ 7,392,528		$ 6,875,613		$ 7,539,449		$ 6,856,108		$ 6,422,226		$ 5,736,780		$ 29,676,768	[1]	$ 26,554,563	[1]	$ 23,487,872	[1]
Loss on extinguishment of debt													58,800				0		59,545		0
Impact of changes in tax legislation	(28,300)								124,700
Gross profit	975,370		923,778		932,820		868,944		929,180		842,567		824,024		761,197		3,700,912		3,356,968		3,144,322
Operating income	334,380		290,310		286,827		235,995		286,824		235,441		230,446		193,025		1,147,512		945,736		876,826
Net income attributable to shareholders	$ 230,653	[2]	$ 176,533		$ 169,915		$ 139,094		$ 53,653	[2]	$ 134,064		$ 99,722	[3]	$ 114,737		$ 716,195		$ 402,176		$ 522,815
Basic	$ 2.66	[4]	$ 2.02	[4]	$ 1.94	[4]	$ 1.58	[4]	$ 0.61	[4]	$ 1.52	[4]	$ 1.12	[4]	$ 1.29	[4]	$ 8.19		$ 4.54		$ 5.75
Diluted	$ 2.63	[4]	$ 1.99	[4]	$ 1.92	[4]	$ 1.56	[4]	$ 0.60	[4]	$ 1.50	[4]	$ 1.11	[4]	$ 1.27	[4]	$ 8.10	[5]	$ 4.48	[5]	$ 5.68	[5]

[1] Includes sales related to the United States of $12,157,306, $11,038,930, and $10,137,041 for 2018, 2017, and 2016, respectively.

[2] Net income attributable to shareholders includes a U.S. Tax Act benefit of $28.3 million and expense of $124.7 million during the fourth quarter of 2018 and 2017, respectively.

[3] Net income attributable to shareholders includes a loss on extinguishment of debt of $58.8 million during the second quarter of 2017.

[4] Quarterly net income per share is calculated using the weighted-average shares outstanding during each quarterly period, while net income per share for the full year is calculated using the weighted-average shares outstanding during the year. Therefore, the sum of the net income per share for each of the four quarters may not equal the net income per share for the full year.

[5] Stock-based compensation awards for the issuance of 651 shares, 380 shares, and 766 shares for the years ended December 31, 2018, 2017, and 2016, respectively, were excluded from the computation of net income per share on a diluted basis as their effect was anti-dilutive.