Condensed Consolidated Statements of Cash Flow - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Cash from operating activities:
Net income	$ 331.8	$ 243.2
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	76.7	72.1
Stock-based compensation expense	19.1	15.4
Deferred income tax (benefit) provision	14.2	13.4
Net change in components of working capital	(114.6)	43.8
Net change in other long-term assets and liabilities	(6.2)	(3.6)
Net cash provided by operating activities	321.0	384.3
Cash from investing activities:
Capital expenditures	(78.4)	(60.8)
Proceeds from disposals of property, plant and equipment	0.9	1.2
Purchases of short-term investments	(46.2)	(12.0)
Sales and maturities of short-term investments	48.5	17.7
Acquisitions, net of cash acquired	(185.6)	(16.5)
Other	(2.4)	0.0
Net cash used in investing activities	(263.2)	(70.4)
Cash from financing activities:
Proceeds from issuance of senior notes and other long-term debt	1.2	399.3
Repayments of senior notes and other long-term debt	(0.8)	(0.3)
Borrowings under credit facilities	0.0	1,567.4
Repayments under credit facilities	0.0	(215.0)
(Repayments) borrowings under commercial paper programs, net	811.9	(250.4)
Payment of costs related to debt financing	0.0	(3.9)
Proceeds from exercise of stock options	21.1	30.0
Distributions to and purchases of noncontrolling interests	(7.6)	(8.1)
Purchase of treasury stock	(152.8)	(257.2)
Dividend payments	(86.8)	(74.4)
Net cash provided by financing activities	586.2	1,187.4
Effect of exchange rate changes on cash and cash equivalents	(18.4)	(20.2)
Net change in cash and cash equivalents	625.6	1,481.1
Cash and cash equivalents balance, beginning of period	1,702.0	891.2	$ 891.2
Cash and cash equivalents balance, end of period	2,327.6	2,372.3	$ 1,702.0
Cash paid for:
Interest	28.1	22.0
Income taxes, net	$ 75.2	$ 64.2