Condensed Consolidated Statements of Cash Flow - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Cash from operating activities:
Net income from continuing operations	$ 421.7	$ 349.5	$ 1,122.4	$ 853.1
Adjustments to reconcile net income from continuing operations to cash provided by operating activities from continuing operations:
Depreciation and amortization			274.5	218.0
Stock-based compensation expense			60.2	51.0
Deferred income tax provision (benefit)			24.9	(5.8)
Net change in components of working capital			(414.1)	38.6
Net change in other long-term assets and liabilities			(7.5)	(3.9)
Net cash provided by operating activities from continuing operations			1,060.4	1,151.0
Net cash provided by operating activities from discontinued operations			9.1	0.0
Net cash provided by operating activities			1,069.5	1,151.0
Cash from investing activities:
Capital expenditures			(274.2)	(204.8)
Proceeds from disposals of property, plant and equipment			2.4	10.8
Purchases of short-term investments			(128.0)	(89.3)
Sales and maturities of short-term investments			129.3	71.1
Acquisitions, net of cash acquired			(1,531.0)	(50.3)
Other			(8.5)	0.0
Net cash used in investing activities from continuing operations			(1,810.0)	(262.5)
Net cash used in investing activities from discontinued operations			(4.7)	0.0
Net cash used in investing activities			(1,814.7)	(262.5)
Cash from financing activities:
Proceeds from issuance of senior notes and other long-term debt			749.9	942.3
Repayments of senior notes and other long-term debt			(616.2)	(402.9)
Borrowings under credit facilities			0.0	1,567.4
Repayments under credit facilities			0.0	(1,568.1)
(Repayments) borrowings under commercial paper programs, net			925.0	(385.9)
Payment of costs related to debt financing			(6.1)	(8.7)
Payment of acquisition-related contingent consideration			0.0	(75.0)
Proceeds from exercise of stock options			180.9	256.6
Payment of deferred purchase price related to acquisitions			(4.1)	(16.2)
Distributions to and purchases of noncontrolling interests			(11.3)	(11.5)
Purchase of treasury stock			(491.0)	(459.2)
Dividend payments	(86.6)	(74.6)	(260.0)	(223.0)
Transfers to discontinued operations			(28.7)	0.0
Net cash provided by (used in) financing activities from continuing operations			438.4	(384.2)
Net cash provided by (used in) financing activities from discontinued operations			(0.1)	0.0
Net cash provided by (used in) financing activities			438.3	(384.2)
Effect of exchange rate changes on cash and cash equivalents			(15.5)	25.0
Net (decrease) increase in cash and cash equivalents			(322.4)	529.3
Cash and cash equivalents balance, beginning of period			1,702.0	891.2	$ 891.2
Cash and cash equivalents balance, end of period	1,379.6	1,420.5	1,379.6	1,420.5	$ 1,702.0
Less: Cash and cash equivalents included in Current assets held for sale, end of period	111.5	0.0	111.5	0.0
Cash and cash equivalents balance of continuing operations, end of period	$ 1,268.1	$ 1,420.5	1,268.1	1,420.5
Cash paid for:
Interest			78.8	74.5
Income taxes, net			$ 305.4	$ 262.9