CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net income	$ 514.1	$ 247.8
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	84.6	77.3
Amortization	3.3	3.3
Stock-based compensation	27.5	27.6
Pension settlement charge	0.7	3.4
Contingent consideration payments in excess of acquisition-date liability	(1.0)	(0.7)
Other non-cash items, net	(17.5)	(9.5)
Changes in assets and liabilities	(188.5)	(25.4)
Net cash provided by operating activities	423.2	323.8
Cash flows from investing activities:
Capital expenditures	(176.9)	(116.7)
Purchase of intangibles	0.0	(3.8)
Other, net	1.2	(1.4)
Net cash used in investing activities	(175.7)	(121.9)
Cash flows from financing activities:
Repayments of long-term debt	(1.1)	(1.7)
Dividend payments	(37.8)	(35.5)
Proceeds from stock-based compensation awards	23.1	22.0
Employee stock purchase plan contributions	5.7	4.6
Shares purchased under share repurchase programs	(137.1)	(115.5)
Shares repurchased for employee tax withholdings	(14.7)	(2.3)
Net cash used in financing activities	(161.9)	(128.4)
Effect of exchange rates on cash	(13.1)	6.8
Net increase (decrease) in cash and cash equivalents	72.5	80.3
Cash, including cash equivalents at beginning of period	615.5	439.1
Cash, including cash equivalents at end of period	$ 688.0	$ 519.4