Condensed Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Operating Activities
Net Income (Loss) Attributable to Parent	$ 1.2	$ 47.8
Adjustments to reconcile net income to net cash and cash equivalents provided by (used for) operating activities:
Depreciation and amortization	132.2	129.7
Stock-based compensation	4.0	4.4
Deferred income taxes	(18.2)	(13.9)
Qualified pension plan contributions	(0.1)	(0.3)
Qualified pension plan income	(5.0)	(6.0)
Change in assets and liabilities:
Receivables	(98.2)	(37.5)
Income taxes receivable/payable	(34.0)	9.6
Inventories	(43.9)	31.2
Other current assets	4.2	3.6
Accounts payable and accrued liabilities	(32.5)	(95.9)
Other assets	4.6	(0.7)
Other noncurrent liabilities	1.1	5.7
Other operating activities	(1.4)	3.3
Net operating activities	(86.0)	81.0
Investing Activities
Capital expenditures	(61.4)	(44.3)
Payments under other long-term supply contracts	0.0	(28.5)
Other investing activities	(1.0)	(1.9)
Net investing activities	(62.4)	(74.7)
Long-term debt:
Borrowings	2,041.0	217.0
Repayments	(1,841.1)	(122.3)
Common stock repurchased and retired	(20.2)	(105.4)
Stock options exercised	1.9	19.8
Employee taxes paid for share-based payment arrangements	0.0	(10.5)
Dividends paid	(23.0)	(23.9)
Payment of Financing and Stock Issuance Costs	(12.0)	0.0
Net financing activities	146.6	(25.3)
Effect of exchange rate changes on cash and cash equivalents	0.2	(0.4)
Net decrease in cash and cash equivalents	(1.6)	(19.4)
Cash and cash equivalents, beginning of year	175.6	170.3
Cash and cash equivalents, end of period	174.0	150.9
Cash paid for interest and income taxes:
Interest, net	65.3	62.9
Income taxes, net of refunds	50.5	15.8
Non-cash investing activities:
Decrease in capital expenditures included in accounts payable and accrued liabilities	$ 26.9	$ 9.6