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Consolidated Statements of Cash Flows (unaudited) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Operating activities:      
Net income $ 23.6 $ 39.2  
Adjustments to reconcile net income to net cash provided (required) by operating activities:      
Depreciation, depletion, and amortization 53.6 42.8  
Stock-based compensation expense 6.7 6.7  
Provision for deferred income taxes 1.3 7.1  
Gain on disposition of property, plant, equipment, and other assets (3.8) (3.9)  
Gain on sale of businesses (0.3) (7.0)  
(Increase) decrease in other assets 1.4 (2.2)  
Increase (decrease) in other liabilities (2.9) (2.4)  
Other 0.4 (4.4)  
Changes in current assets and liabilities:      
(Increase) decrease in receivables (77.6) (10.2)  
(Increase) decrease in inventories (4.1) 4.5  
(Increase) decrease in other current assets 5.8 1.2  
Increase (decrease) in accounts payable 46.2 3.7  
Increase (decrease) in advance billings (29.0) 5.0  
Increase (decrease) in accrued liabilities (22.0) 0.4  
Net cash provided (required) by operating activities (0.7) 80.5  
Investing activities:      
Proceeds from disposition of property, plant, equipment, and other assets 5.0 4.2  
Proceeds from sale of businesses 0.0 6.7  
Capital expenditures (34.0) (54.4)  
Cash received (paid) for acquisitions 17.6 0.0  
Net cash required by investing activities (11.4) (43.5)  
Financing activities:      
Payments to retire debt (3.3) (1.7)  
Proceeds from issuance of debt 0.0 40.0  
Dividends paid to common stockholders (2.5) (2.4)  
Purchase of shares to satisfy employee tax on vested stock (1.5) (1.2)  
Net cash provided (required) by financing activities (7.3) 34.7  
Net increase (decrease) in cash and cash equivalents (19.4) 71.7  
Cash and cash equivalents at beginning of period 187.3 104.8 $ 104.8
Cash and cash equivalents at end of period $ 167.9 [1] $ 176.5 $ 187.3
[1] (unaudited)