CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Net income	$ 140.0	$ 173.8
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	30.7	28.7
Amortization	0.9	0.9
Stock-based compensation	8.5	5.5
Asset impairments	11.3	0.0
Other non-cash items, net	(6.5)	(7.5)
Changes in assets and liabilities	(46.8)	(50.2)
Net cash provided by operating activities	138.1	151.2
Cash flows from investing activities:
Capital expenditures	(82.1)	(65.8)
Other, net	0.0	(2.5)
Net cash used in investing activities	(82.1)	(68.3)
Cash flows from financing activities:
Repayments of long-term debt	(0.6)	(0.6)
Debt issuance costs	0.0	(1.1)
Dividend payments	(14.1)	(13.4)
Proceeds from stock-based compensation awards	13.5	6.3
Employee stock purchase plan contributions	1.8	2.0
Shares purchased under share repurchase program	(60.1)	(147.1)
Shares repurchased for employee tax withholdings	(11.5)	(18.8)
Net cash used in financing activities	(71.0)	(172.7)
Effect of exchange rates on cash	7.0	(5.1)
Net decrease in cash and cash equivalents	(8.0)	(94.9)
Cash, including cash equivalents at beginning of period	894.3	762.6
Cash, including cash equivalents at end of period	$ 886.3	$ 667.7