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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
CASH FLOWS FROM OPERATING ACTIVITIES              
Net income (loss) $ (53.3) $ (6.3) $ 5.8 $ 17.2 $ (56.9) $ (2.8)  
Goodwill, Impairment Loss 48.0   0.0   48.0 0.0  
Depreciation and amortization         68.7 78.3  
Equity-based compensation expense 0.6   (0.9)   4.1 7.2  
Deferred Income Taxes and Tax Credits         (7.0) (10.0)  
Defined benefit pension and other postretirement employee benefits         (0.3) (3.2)  
Gain (Loss) on Disposition of Business (1.1)   0.0   (1.1) 0.0  
Amortization of Debt Issuance Costs and Discounts         1.7 2.0  
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property         (5.1) (1.6)  
(Increase) decrease in accounts receivable         26.8 (62.3)  
Increase in inventories         (25.3) (5.6)  
Decrease in other current assets         9.9 3.4  
Increase (decrease) in accounts payable and accrued liabilities         (65.0) 89.8  
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Other Item         (1.4) (1.9)  
Net cash flows provided by operating activities         7.3 96.5  
CASH FLOWS FROM INVESTING ACTIVITIES              
Additions to property, plant and equipment, net 1         (73.9) (83.6)  
Payments to Acquire Businesses, Gross         0.0 (708.2)  
Proceeds from Divestiture of Businesses         (12.1) 0.0  
Net cash flows used in investing activities         (86.0) (791.8)  
CASH FLOWS FROM FINANCING ACTIVITIES              
Proceeds from Issuance of Long-Term Debt         72.0 753.5  
Repayments of Long-term Debt         (18.5) (50.9)  
Payments for Repurchase of Common Stock         (17.2) (6.0)  
Payments of Debt Issuance Costs         0.0 (4.9)  
Proceeds from (Payment for) Other Financing Activity         (2.8) (2.7)  
Net cash flows provided by financing activities         33.5 688.9  
Decrease in cash and cash equivalents         (45.2) (6.5)  
Cash and cash equivalents at beginning of period   $ 79.6   $ 42.0 79.6 42.0 $ 42.0
Cash and cash equivalents at end of period $ 34.4   $ 35.5   34.4 35.5 79.6
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:              
Cash paid for interest, net of amounts capitalized         14.8 42.7  
Income Taxes Paid         57.4 14.8  
Capital Expenditures Incurred but Not yet Paid         $ 11.8 [1] $ 25.5 [1] $ 25.8
[1] Capital expenditures of $11.8 million and $25.5 million that have not been paid as of September 30, 2025 and 2024 were excluded from the Statements of Cash Flows.