Condensed Consolidated Statements of Cash Flow - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Cash from operating activities:
Net income	$ 349.5	$ 282.3	$ 853.1	$ 843.2
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization			218.0	235.4
Stock-based compensation expense			51.0	46.4
Loss on early extinguishment of debt	0.0	14.3	0.0	14.3
Deferred income tax provision (benefit)			(5.8)	(37.5)
Net change in components of working capital			38.6	(27.1)
Net change in other long-term assets and liabilities			(3.9)	3.5
Net cash provided by operating activities			1,151.0	1,078.2
Cash from investing activities:
Capital expenditures			(204.8)	(223.0)
Proceeds from disposals of property, plant and equipment			10.8	7.1
Purchases of short-term investments			(89.3)	(48.5)
Sales and maturities of short-term investments			71.1	44.6
Acquisitions, net of cash acquired			(50.3)	(891.2)	$ (937.4)
Net cash used in investing activities			(262.5)	(1,111.0)
Cash from financing activities:
Proceeds from issuance of senior notes			942.3	1,398.8
Repayments of senior notes and other long-term debt			(402.9)	(1,111.2)
Borrowings under credit facilities			1,567.4	0.0
Repayments under credit facilities			(1,568.1)	0.0
(Repayments) borrowings under commercial paper programs, net			(385.9)	137.2
Payment of costs related to debt financing			(8.7)	(14.9)
Payment of premiums and fees related to early extinguishment of debt			0.0	(13.4)
Payment of acquisition-related contingent consideration			(75.0)	0.0
Payment of deferred purchase price related to an acquisition			(16.2)	0.0
Proceeds from exercise of stock options			256.6	146.3
Distributions to and purchases of noncontrolling interests			(11.5)	(25.0)
Purchase of treasury stock			(459.2)	(558.7)
Dividend payments	(74.6)	(68.3)	(223.0)	(205.5)
Net cash used in financing activities			(384.2)	(246.4)
Effect of exchange rate changes on cash and cash equivalents			25.0	(30.8)
Net change in cash and cash equivalents			529.3	(310.0)
Cash and cash equivalents balance, beginning of period			891.2	1,279.3	1,279.3
Cash and cash equivalents balance, end of period	$ 1,420.5	$ 969.3	1,420.5	969.3	$ 891.2
Cash paid for:
Interest			74.5	81.8
Income taxes, net			$ 262.9	$ 333.2