Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Operating activities
Net income	$ 83.6	$ 170.7	$ 76.2
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	185.9	179.7	188.8
Cloud-based enterprise resource planning system impairment	71.6	0.0	0.0
Deferred income tax benefit	(45.4)	(23.8)	(61.3)
Share-based compensation expense	9.1	15.4	13.2
Changes in assets and liabilities:
(Increase) decrease in accounts receivable	(18.3)	(15.2)	38.6
Decrease (increase) in inventories	0.6	(13.7)	24.3
(Decrease) increase in accounts payable	(27.6)	0.3	(22.2)
Decrease in pension, retirement benefits and deferred compensation	(11.3)	(34.3)	(8.7)
Increase (decrease) in restructuring obligations	24.9	(24.8)	2.1
Taxes paid on gain on sale of business	0.0	0.0	(104.1)
(Decrease) increase in environmental obligations	(4.8)	(11.2)	38.9
Decrease (increase) in environmental insurance receivable	34.0	(34.0)	0.0
(Decrease) increase in incentive accruals	(24.0)	31.0	6.4
Accrued expenses and other assets and liabilities, net	23.3	16.7	9.4
Net cash provided by operating activities	301.6	256.8	201.6
Investing activities
Capital expenditures	(106.6)	(121.9)	(119.4)
Net proceeds from divestiture	0.0	0.0	7.3
Proceeds from plant closures	12.9	3.4	7.6
Other investing activities	(3.3)	(2.1)	10.3
Net cash used by investing activities	(97.0)	(120.6)	(94.2)
Financing activities
Proceeds from long-term borrowings	0.0	650.0	0.0
Payments on long-term borrowings	(150.3)	(660.9)	(105.8)
Cash dividends paid	(98.8)	(94.0)	(90.2)
Payments on withholding tax on share awards	(4.1)	(6.4)	(3.4)
Debt financing costs	(3.9)	(9.6)	(2.3)
Net cash used by financing activities	(257.1)	(120.9)	(201.7)
Effect of exchange rate changes on cash	18.5	(16.6)	(1.0)
Decrease in cash and cash equivalents	(34.0)	(1.3)	(95.3)
Cash and cash equivalents at beginning of year	544.5	545.8	641.1
Cash and cash equivalents at end of year	$ 510.5	$ 544.5	$ 545.8