Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net earnings	$ 751.9	$ 578.6	$ 499.4
Adjustments to reconcile net earnings to net cash provided by operating activities, net of acquisitions:
Depreciation of property and equipment	134.1	123.6	103.5
Gain on sale of property and equipment	(0.5)	(1.0)	(0.5)
Bad debt expense	8.1	8.2	8.6
Deferred income taxes	33.8	(30.0)	25.6
Stock-based compensation	5.1	5.2	4.1
Amortization of intangible assets	4.1	3.8	0.5
Changes in operating assets and liabilities, net of acquisitions:
Trade accounts receivable	(120.3)	(103.7)	(40.5)
Inventories	(193.3)	(76.3)	(80.9)
Other current assets	(28.9)	(15.6)	29.1
Accounts payable	46.1	36.3	(17.2)
Accrued expenses	46.8	37.6	(28.6)
Income taxes	(15.5)	19.4	15.5
Other	2.7	(0.9)	1.3
Net cash provided by operating activities	674.2	585.2	519.9
Cash flows from investing activities:
Purchases of property and equipment	(176.3)	(119.9)	(189.5)
Proceeds from sale of property and equipment	9.5	7.4	6.5
Cash paid for acquisitions	(3.7)	(58.7)	0.0
Other	(3.4)	(8.1)	(5.1)
Net cash used in investing activities	(173.9)	(179.3)	(188.1)
Cash flows from financing activities:
Proceeds from debt obligations	980.0	1,015.0	950.0
Payments against debt obligations	(895.0)	(980.0)	(920.0)
Proceeds from exercise of stock options	13.4	9.5	29.3
Purchases of common stock	(103.0)	(82.6)	(59.5)
Payments of dividends	(441.9)	(369.1)	(346.6)
Net cash used in financing activities	(446.5)	(407.2)	(346.8)
Effect of exchange rate changes on cash and cash equivalents	(3.5)	5.5	(1.3)
Net increase (decrease) in cash and cash equivalents	50.3	4.2	(16.3)
Cash and cash equivalents at beginning of year	116.9	112.7	129.0
Cash and cash equivalents at end of year	167.2	116.9	112.7
Supplemental disclosure of cash flow information:
Cash paid for interest	12.6	8.7	6.2
Net cash paid for income taxes	$ 215.3	$ 304.1	$ 248.3