Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net earnings	$ 283.1	$ 257.7
Adjustments to reconcile net earnings to net cash provided by operating activities, net of acquisition:
Depreciation of property and equipment	60.8	47.9
Gain on sale of property and equipment	(1.0)	(0.1)
Bad debt expense	4.0	3.9
Deferred income taxes	0.8	2.3
Stock-based compensation	2.8	1.7
Amortization of intangible assets	1.8	0.3
Changes in operating assets and liabilities, net of acquisition:
Trade accounts receivable	(108.0)	(70.6)
Inventories	(32.1)	(68.1)
Other current assets	2.5	18.5
Accounts payable	30.0	32.7
Accrued expenses	24.0	(8.5)
Income taxes	24.8	36.3
Other	(0.2)	(0.5)
Net cash provided by operating activities	293.3	253.5
Cash flows from investing activities:
Purchases of property and equipment	(57.4)	(88.7)
Proceeds from sale of property and equipment	4.6	3.0
Cash paid for acquisition	(58.7)	0.0
Other	1.8	(0.2)
Net cash used in investing activities	(109.7)	(85.9)
Cash flows from financing activities:
Proceeds from debt obligations	550.0	435.0
Payments against debt obligations	(495.0)	(370.0)
Proceeds from exercise of stock options	3.3	22.4
Purchases of common stock	(56.7)	(59.5)
Payments of dividends	(185.1)	(173.2)
Net cash used in financing activities	(183.5)	(145.3)
Effect of exchange rate changes on cash and cash equivalents	2.3	4.1
Net increase in cash and cash equivalents	2.4	26.4
Cash and cash equivalents at beginning of period	112.7	129.0
Cash and cash equivalents at end of period	115.1	155.4
Supplemental disclosure of cash flow information:
Cash paid for interest	3.5	2.9
Net cash paid for income taxes	$ 137.1	$ 110.9