Condensed Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Net sales	$ 4,822,065	$ 4,100,178	$ 9,408,359	$ 8,005,819
Cost of goods sold	3,300,479	2,860,466	6,450,966	5,610,386
Gross profit	1,521,586	1,239,712	2,957,393	2,395,433
Operating expenses:
Selling, administrative and other expenses	1,148,217	906,943	2,281,988	1,784,299
Depreciation and amortization	58,451	39,232	116,814	77,364
Provision for doubtful accounts	3,666	2,546	6,367	5,674
Total operating expenses	1,210,334	948,721	2,405,169	1,867,337
Non-operating expenses (income):
Interest expense	26,476	7,446	50,585	14,225
Other	(15,495)	(13,592)	(27,951)	(27,041)
Total non-operating expenses (income)	10,981	(6,146)	22,634	(12,816)
Income before income taxes	300,271	297,137	529,590	540,912
Income taxes	73,299	107,165	126,042	190,780
Net income	$ 226,972	$ 189,972	$ 403,548	$ 350,132
Basic net income per common share (usd per share)	$ 1.55	$ 1.29	$ 2.75	$ 2.37
Diluted net income per common share (usd per share)	1.54	1.29	2.74	2.36
Dividends declared per common share (usd per share)	$ 0.72	$ 0.6750	$ 1.44	$ 1.350
Weighted average common shares outstanding (in shares)	146,748	147,079	146,738	147,613
Dilutive effect of stock options and non-vested restricted stock awards (in shares)	512	571	548	598
Weighted average common shares outstanding - assuming dilution (in shares)	147,260	147,650	147,286	148,211
Other comprehensive income (loss), net of income taxes:
Foreign currency translation adjustment	$ (163,993)	$ 23,157	$ (121,113)	$ 80,177
Net investment hedge, net of income taxes in 2018 — ($5,935)	32,755	0	16,045	0
Pension and postretirement benefit adjustments, net of income taxes in 2018 — $2,642 and $5,290; 2017 — $3,568 and $7,139 respectively	7,145	5,723	14,309	11,455
Other comprehensive (loss) income, net of income taxes	(124,093)	28,880	(90,759)	91,632
Comprehensive income	$ 102,879	$ 218,852	$ 312,789	$ 441,764