Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Cash flows from operating activities:
Net income	$ 298.7	$ 297.7
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property and equipment	42.0	40.2
Gain on sale of property and equipment	(0.3)	(0.6)
Bad debt expense (recoveries)	1.8	(0.9)
Deferred income taxes	0.7	0.8
Stock-based compensation	2.0	2.0
Amortization of intangible assets	2.7	2.7
Changes in operating assets and liabilities:
Trade accounts receivable	(170.0)	(127.6)
Inventories	(26.5)	21.9
Other current assets	10.2	34.9
Accounts payable	45.3	15.6
Accrued expenses	(8.8)	(31.9)
Income taxes	70.9	74.5
Other	(6.5)	6.3
Net cash provided by operating activities	262.2	335.6
Cash flows from investing activities:
Purchases of property and equipment	(55.7)	(50.8)
Proceeds from sale of property and equipment	1.9	2.5
Other	(0.0)	(0.1)
Net cash used in investing activities	(53.8)	(48.4)
Cash flows from financing activities:
Proceeds from debt obligations	155.0	160.0
Payments against debt obligations	(155.0)	(220.0)
Proceeds from exercise of stock options	11.2	15.8
Cash dividends paid	(246.7)	(223.2)
Net cash used in financing activities	(235.5)	(267.4)
Effect of exchange rate changes on cash and cash equivalents	3.1	(4.0)
Net (decrease) increase in cash and cash equivalents	(24.0)	15.8
Cash and cash equivalents at beginning of period	255.8	221.3
Cash and cash equivalents at end of period	231.8	237.1
Supplemental information:
Cash paid for interest	1.5	2.4
Net cash paid for income taxes	21.9	15.9
Operating lease right-of-use assets obtained in exchange for new operating lease liabilities	$ 30.4	$ 30.4