Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities
Net income	$ 105.7	$ 126.3	$ 16.1
Reconciliation to net cash provided by operating activities:
Depreciation and amortization	124.8	126.2	138.0
Amortization of deferred financing costs and debt discount	0.6	0.7	3.1
Deferred income taxes	(32.7)	(3.1)	(2.6)
Equity in earnings from affiliated companies	(8.1)	(8.1)	0.0
Stock-based compensation	20.9	20.0	19.0
Restructuring expenses, net of payments	(4.4)	(0.7)	(5.6)
Pension Settlement	70.5	0.0	0.0
Gain on sale of assets	(0.8)	(19.4)	0.0
Impairment of assets	3.1	1.6	0.0
Loss (gain) on sale of investments	3.0	(0.3)	0.0
Changes in assets and liabilities:
Increase in accounts receivable	(8.9)	(62.8)	(40.7)
Increase in inventories	(8.9)	(82.4)	(40.4)
Decrease (increase) in prepaid expenses and other current assets	2.6	(8.3)	13.0
(Decrease) increase in accounts payable/accrued liabilities	(12.2)	80.8	49.8
Other – net	1.9	2.6	2.0
Net cash provided by operating activities	257.1	173.1	151.7
Cash flows from investing activities
Capital expenditures	(108.2)	(76.3)	(27.9)
Proceeds from sale of assets	10.3	21.2	0.0
Proceeds from sale of investments	47.2	0.5	0.0
Net cash used for investing activities	(50.7)	(54.6)	(27.9)
Cash flows from financing activities
Repayment of finance lease obligation and other debt, net	(0.2)	(0.6)	(0.9)
Issuance costs related to senior credit facility	(2.5)	0.0	0.0
Dividends paid	(42.2)	(33.7)	0.0
Repurchase of stock	(30.1)	0.0	0.0
Activity under stock plans	7.4	4.3	7.1
Net cash used for financing activities	(92.6)	(130.0)	(96.8)
Effect of exchange rate changes on cash and cash equivalents	1.2	(4.2)	(2.6)
Net increase (decrease) in cash and cash equivalents	115.0	(15.7)	24.4
Cash and cash equivalents at beginning of period	112.0	127.7	103.3
Cash and cash equivalents at end of period	227.0	112.0	127.7
Supplemental data:
Interest, net of capitalized interest	34.6	35.4	36.1
Income Taxes	59.1	35.9	1.2
Accrual basis additions to property, plant and equipment	121.6	69.8	41.4
Senior Unsecured Credit Facility Two Thousand Twenty Eight [Member]
Cash flows from financing activities
Borrowing from senior unsecured credit facility	98.0	0.0	0.0
Repayment of senior unsecured credit facility	(98.0)	0.0	0.0
Senior Unsecured Credit Facility Two Thousand Twenty Four [Member]
Cash flows from financing activities
Borrowing from senior unsecured credit facility	65.0	50.0	0.0
Repayment of senior unsecured credit facility	$ (90.0)	$ (150.0)	$ (103.0)