Statements of Consolidated Income and Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Net sales	$ 3,965,006	$ 2,761,387
Cost of goods sold	2,278,159	1,418,334
Gross profit	$ 1,686,847	$ 1,343,053
Percent to net sales	42.50%	48.60%
Selling, general and administrative expenses	$ 1,214,565	$ 1,011,021
Percent to net sales	30.60%	36.60%
Other general expense - net	$ 2,990	$ 276
Amortization	85,049	6,170
Interest expense	91,547	25,695
Interest and net investment income	(1,618)	(1,280)
Other income - net	(9,272)	(5,434)
Income before income taxes	303,586	306,605
Income taxes	53,459	67,453
Net income	$ 250,127	$ 239,152
Net income per common share - basic (in dollars per share)	$ 2.68	$ 2.58
Net income per common share - diluted (in dollars per share)	$ 2.62	$ 2.53
Average shares outstanding - basic (in shares)	93,339,564	92,550,559
Average shares and equivalents outstanding - diluted (in shares)	95,546,152	94,541,859
Comprehensive income	$ 299,342	$ 230,090