Condensed Consolidated Statements of Cash Flow - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Cash from operating activities:
Net income	$ 552.0	$ 442.7
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	103.8	96.3
Stock-based compensation expense	23.8	21.7
Deferred income tax provision (benefit)	1.9	0.1
Net change in components of working capital	(73.9)	(23.8)
Net change in other long-term assets and liabilities	(8.1)	(4.6)
Net cash provided by operating activities	599.5	532.4
Cash from investing activities:
Capital expenditures	(94.3)	(97.7)
Proceeds from disposals of property, plant and equipment	0.5	0.8
Purchases of investments	(11.9)	(56.7)
Sales and maturities of investments	87.6	10.0
Acquisitions, net of cash acquired	0.0	(113.2)
Other, net	1.1	0.2
Net cash used in investing activities	(17.0)	(256.6)
Cash from financing activities:
Proceeds from issuance of senior notes and other long-term debt	0.0	350.2
Repayments of senior notes and other long-term debt	(1.1)	(3.1)
(Repayments) borrowings under commercial paper programs, net	0.0	(387.5)
Payment of costs related to debt financing	(2.9)	(2.3)
Purchase of treasury stock	(153.8)	(166.9)
Proceeds from exercise of stock options	113.3	74.3
Distributions to and purchases of noncontrolling interests	0.0	(5.2)
Dividend payments	(131.7)	(124.9)
Net cash used in financing activities	(176.2)	(265.4)
Effect of exchange rate changes on cash and cash equivalents	(24.2)	7.6
Net increase (decrease) in cash and cash equivalents	382.1	18.0
Cash and cash equivalents balance, beginning of period	1,475.0	1,373.1	$ 1,373.1
Cash and cash equivalents balance, end of period	1,857.1	1,391.1	$ 1,475.0
Cash paid for:
Interest	32.8	34.9
Income taxes, net	$ 130.1	$ 116.1