Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Net sales	$ 4,464,714	$ 4,092,526
Cost of goods sold	2,923,899	2,704,348
Gross profit	1,540,815	1,388,178
Operating expenses:
Selling, administrative and other expenses	1,195,164	1,142,697
Depreciation and amortization	72,296	67,254
Provision for doubtful accounts	4,909	6,519
Restructuring costs	0	2,982
Total operating expenses	1,272,369	1,219,452
Non-operating (income) expense:
Interest expense	19,062	20,965
Other	(36,475)	(12,832)
Total non-operating (income) expense	(17,413)	8,133
Income before income taxes	285,859	160,593
Income taxes	68,149	38,247
Net income from continuing operations	217,710	122,346
Net income from discontinued operations	0	14,189
Net income	$ 217,710	$ 136,535
Dividends declared per common share (usd per share)	$ 0.8150	$ 0.7900
Basic earnings per share:
Continuing operations (in dollars per share)	1.51	0.84
Discontinued operations (in dollars per share)	0	0.10
Basic earnings (loss) per share (in dollars per share)	1.51	0.94
Diluted earnings per share:
Continuing operations (in dollars per share)	1.50	0.84
Discontinued operations (in dollars per share)	0	0.10
Diluted earnings (loss) per share (in dollars per share)	$ 1.50	$ 0.94
Weighted average common shares outstanding (in shares)	144,413	145,052
Dilutive effect of stock options and non-vested restricted stock awards (in shares)	887	571
Weighted average common shares outstanding - assuming dilution (in shares)	145,300	145,623