CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
CONSOLIDATED STATEMENTS OF CASH FLOWS [Abstract]
Net income (loss)	$ (14.0)	$ 170.9	$ 88.3
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion, and amortization	91.2	94.9	95.0
Provision for litigation accrual and credit losses	215.0	30.0	0.0
Loss (gain) on disposal of property, plant, and equipment	3.3	(11.8)	2.0
Deferred income taxes	(45.8)	(7.6)	(34.8)
Pension amortization and settlement loss	0.0	1.1	2.3
Provision for bad debts	4.1	1.4	2.8
Stock-based compensation	11.9	11.8	11.3
Impairment of assets	0.0	0.0	71.7
Reduction of right of use asset	15.7	14.4	14.1
Non-cash debt extinguishment expenses	0.0	1.8	0.0
Restructuring costs	15.0	0.0	6.9
Other non-cash items, net	(4.9)	(6.6)	(4.3)
Changes in operating assets and liabilities
Accounts receivable	(5.2)	5.2	1.8
Inventories	(2.0)	(26.2)	18.7
Pension plan funding	(8.6)	(11.7)	(9.9)
Accounts payable	(2.2)	2.3	(2.9)
Restructuring liabilities	(2.8)	(1.4)	(2.8)
Income taxes payable	(19.2)	5.8	6.7
Prepaid expenses and other	(57.8)	(37.9)	(33.3)
Net cash provided by operating activities	193.7	236.4	233.6
Investing Activities:
Purchases of property, plant, and equipment	(107.1)	(89.5)	(93.5)
Payments related to acquisition of business, net of cash acquired	0.0	(4.0)	(1.8)
Proceeds from sale of assets	6.8	12.3	0.2
Purchases of short-term investments	(14.3)	(8.6)	(17.9)
Proceeds from sale of short-term investments	15.3	8.0	20.0
Other investing activities	(23.5)	(12.7)	1.3
Net cash used in investing activities	(122.8)	(94.5)	(91.7)
Long-term debt issuance	0.0	575.0	0.0
Debt issuance costs	0.0	(6.7)	0.0
Repayment of long-term debt	(6.6)	(533.6)	(14.8)
Repayment of short-term debt	(4.8)	(80.2)	(34.5)
Purchase of common stock for treasury	(58.5)	(63.6)	(14.2)
Proceeds from issuance of stock under option plan	2.4	15.7	5.1
Tax withholding payments for stock-based compensation	(3.5)	(2.8)	(2.8)
Dividends paid to non-controlling interests	(4.1)	(1.0)	(2.4)
Cash dividends paid	(14.2)	(13.2)	(8.1)
Net cash used in financing activities	(89.3)	(110.4)	(71.7)
Effect of exchange rate changes on cash and cash equivalents	14.3	(15.6)	(0.2)
Net increase (decrease) in cash and cash equivalents	(4.1)	15.9	70.0
Cash and cash equivalents at beginning of period	333.1	317.2	247.2
Cash and cash equivalents at end of period	329.0	333.1	317.2
Non-cash investing and financing activities
Property, plant, and equipment additions related to asset retirement obligations	0.0	7.0	0.0
Treasury stock purchases settled after period end	0.1	0.1	0.6
Excise tax charged to equity not paid	$ 0.1	$ 0.4	$ 0.0