Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Net sales	$ 18,735,073	$ 16,308,801	$ 15,339,713
Cost of goods sold	12,751,286	11,402,403	10,740,106
Gross margin	5,983,787	4,906,398	4,599,607
Operating expenses:
Selling, administrative, and other expenses	4,615,290	3,726,233	3,391,971
Depreciation and amortization	241,635	167,691	147,487
Provision for doubtful accounts	17,147	13,932	11,515
Total operating expenses	4,874,072	3,907,856	3,550,973
Non-operating expenses (income):
Interest expense	101,925	41,486	21,084
Other	(67,822)	(52,212)	(46,790)
Total non-operating expenses (income)	34,103	(10,726)	(25,706)
Income before income taxes	1,075,612	1,009,268	1,074,340
Income taxes	265,138	392,511	387,100
Net income	$ 810,474	$ 616,757	$ 687,240
Basic net income per common share (in dollars per share)	$ 5.53	$ 4.19	$ 4.61
Diluted net income per common share (in dollars per share)	$ 5.50	$ 4.18	$ 4.59
Weighted average common shares outstanding (in shares)	146,657	147,140	149,051
Dilutive effect of stock options and nonvested restricted stock awards (in shares)	584	561	753
Weighted average common shares outstanding — assuming dilution (in shares)	147,241	147,701	149,804
Net income	$ 810,474	$ 616,757	$ 687,240
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustment	(233,235)	137,694	(8,957)
Net gain (loss) on cash flow and net investment hedges, net of income taxes of 2018 — $10,398; 2017 — $9,711	28,114	(17,388)	0
Pension and postretirement benefit adjustments, net of income taxes of 2018 — $21,297; 2017 — $20,539; 2016 — $50,144	(57,365)	40,123	(73,446)
Other comprehensive (loss) income, net of tax	(262,486)	160,429	(82,403)
Comprehensive income	$ 547,988	$ 777,186	$ 604,837