Statements of Consolidated Income and Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Net sales	$ 2,574,024	$ 2,450,284
Cost of goods sold	1,312,279	1,317,835
Gross profit	$ 1,261,745	$ 1,132,449
Percent to net sales	49.00%	46.20%
Selling, general and administrative expenses	$ 1,002,355	$ 929,197
Percent to net sales	38.90%	37.90%
Other general expense (income) - net	$ 17,554	$ (1,673)
Interest expense	25,732	12,351
Interest and net investment income	(487)	(422)
Other expense (income) - net	226	(245)
Income before income taxes	216,365	193,241
Income taxes	69,237	61,837
Net income	$ 147,128	$ 131,404
Net income per common share:
Basic (in dollars per share)	$ 1.61	$ 1.42
Diluted (in dollars per share)	$ 1.57	$ 1.38
Average shares outstanding - basic	91,475,860	92,740,059
Average shares and equivalents outstanding - diluted	93,548,234	95,278,725
Comprehensive income	$ 166,138	$ 75,057