Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net earnings	$ 202.6	$ 194.1
Adjustments to reconcile net earnings to net cash provided by operating activities, net of acquisition:
Depreciation of property and equipment	37.6	35.4
Gain on sale of property and equipment	(0.4)	(0.3)
Bad debt expense	1.9	2.0
Deferred income taxes	0.5	0.6
Stock-based compensation	1.6	1.6
Amortization of intangible assets	1.0	1.0
Changes in operating assets and liabilities, net of acquisition:
Trade accounts receivable	(101.4)	(79.5)
Inventories	10.6	(13.5)
Other current assets	33.2	30.1
Accounts payable	19.3	(9.7)
Accrued expenses	(24.0)	(8.0)
Income taxes	56.2	50.7
Other	2.4	0.4
Net cash provided by operating activities	241.1	204.9
Cash flows from investing activities:
Purchases of property and equipment	(48.8)	(54.4)
Proceeds from sale of property and equipment	2.1	1.6
Cash paid for acquisition	(125.0)	0.0
Other	0.0	0.1
Net cash used in investing activities	(171.7)	(52.7)
Cash flows from financing activities:
Proceeds from debt obligations	325.0	210.0
Payments against debt obligations	(215.0)	(240.0)
Proceeds from exercise of stock options	7.4	18.1
Purchases of common stock	(52.0)	0.0
Payments of dividends	(143.6)	(123.0)
Net cash used in financing activities	(78.2)	(134.9)
Effect of exchange rate changes on cash and cash equivalents	(5.4)	0.9
Net (decrease) increase in cash and cash equivalents	(14.2)	18.2
Cash and cash equivalents at beginning of period	174.9	167.2
Cash and cash equivalents at end of period	160.7	185.4
Supplemental information:
Cash paid for interest	2.2	4.0
Net cash paid for income taxes	10.2	11.7
Leased assets obtained in exchange for new operating lease liabilities	$ 25.0	$ 21.8