Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net income	$ 297.7	$ 295.1
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property and equipment	40.2	41.8
Gain on sale of property and equipment	(0.6)	(0.6)
Bad debt recoveries	(0.9)	(1.4)
Deferred income taxes	0.8	0.3
Stock-based compensation	2.0	1.9
Amortization of intangible assets	2.7	2.7
Changes in operating assets and liabilities:
Trade accounts receivable	(127.6)	(133.7)
Inventories	21.9	57.7
Other current assets	34.9	45.4
Accounts payable	15.6	8.5
Accrued expenses	(31.9)	(11.9)
Income taxes	74.5	83.9
Other	6.3	(1.2)
Net cash provided by operating activities	335.6	388.5
Cash flows from investing activities:
Purchases of property and equipment	(50.8)	(33.7)
Proceeds from sale of property and equipment	2.5	2.8
Other	(0.1)	(0.1)
Net cash used in investing activities	(48.4)	(31.0)
Cash flows from financing activities:
Proceeds from debt obligations	160.0	230.0
Payments against debt obligations	(220.0)	(385.0)
Proceeds from exercise of stock options	15.8	5.9
Cash dividends paid	(223.2)	(199.8)
Net cash used in financing activities	(267.4)	(348.9)
Effect of exchange rate changes on cash and cash equivalents	(4.0)	1.1
Net increase in cash and cash equivalents	15.8	9.7
Cash and cash equivalents at beginning of period	221.3	230.1
Cash and cash equivalents at end of period	237.1	239.8
Supplemental information:
Cash paid for interest	2.4	5.1
Net cash paid for income taxes	15.9	9.7
Leased assets obtained in exchange for new operating lease liabilities	$ 30.4	$ 25.9