Condensed Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019		Mar. 31, 2018
Income Statement [Abstract]
Net sales	$ 4,736,833		$ 4,586,294
Cost of goods sold	3,228,665		3,150,487
Gross profit	1,508,168		1,435,807
Operating expenses:
Selling, administrative and other expenses	1,197,220		1,133,771
Depreciation and amortization	61,977		58,363
Provision for doubtful accounts	3,969		2,701
Total operating expenses	1,263,166		1,194,835
Non-operating expenses (income):
Interest expense	23,883		24,109
Other	9,607		(12,456)
Total non-operating expenses (income)	33,490		11,653
Income before income taxes	211,512		229,319
Income taxes	51,262		52,743
Net income	$ 160,250		$ 176,576
Basic net income per common share (usd per share)	$ 1.10		$ 1.20
Diluted net income per common share (usd per share)	1.09		1.20
Dividends declared per common share (usd per share)	$ 0.7625		$ 0.7200
Weighted average common shares outstanding (in shares)	145,981		146,727
Dilutive effect of stock options and non-vested restricted stock awards (in shares)	713		595
Weighted average common shares outstanding - assuming dilution (in shares)	146,694		147,322
Other comprehensive income, net of income taxes:
Foreign currency translation adjustments	$ 27,117		$ 42,880
Cash flow and net investment hedges adjustments, net of income taxes in 2019 and 2018 — $5,795 and $6,180 respectively	15,668		(16,710)
Pension and postretirement benefit adjustments, net of income taxes in 2019 and 2018 — $1,788 and $2,648, respectively	4,832		7,164
Other comprehensive income, net of income taxes	47,617	[1]	33,334
Comprehensive income	$ 207,867		$ 209,910

[1] Includes the effects of reclassifying realized currency losses of $27,037 out of accumulated other comprehensive loss into earnings in connection with the March 7, 2019 sale of Grupo Auto Todo. Refer to the accumulated other comprehensive loss footnote for further details.