Quarterly Financial Data Quarterly impact of recently issued accounting standards (Details) - USD ($) $ 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
New Accounting Pronouncements or Change in Accounting Principle [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]
Cost of sales						6,610,269		6,013,541	5,598,202		4,975,583	25,975,856		23,197,595		20,343,550
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
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Sales						7,633,870		6,953,740	6,465,346		5,759,552			26,812,508		23,825,261
Cost of sales						6,703,742		6,110,382	5,641,380		4,999,665			23,455,169		20,681,062
Operating income						270,914		235,992	229,822		191,722			928,450		858,539
Net income attributable to shareholders						$ 53,885		$ 134,630	$ 99,679		$ 113,768			$ 401,962		$ 522,750

[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.