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Consolidated Statements of Cash Flows (unaudited) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Operating activities:      
Net income $ 55.7 $ 20.2  
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation, depletion, and amortization 38.8 37.8  
Stock-based compensation expense 5.5 4.4  
Provision for deferred income taxes 7.4 5.1  
Gains on disposition of property, plant, equipment, and other assets (22.6) (1.2)  
Gain on sale of storage tanks business (6.4) 0.0  
(Increase) decrease in other assets 3.4 (1.2)  
Increase (decrease) in other liabilities (2.6) (3.0)  
Other 3.5 0.5  
Changes in current assets and liabilities:      
(Increase) decrease in receivables (66.4) (69.3)  
(Increase) decrease in inventories (10.9) (18.2)  
(Increase) decrease in other current assets 4.6 2.7  
Increase (decrease) in accounts payable 10.5 44.0  
Increase (decrease) in advance billings 8.0 1.8  
Increase (decrease) in accrued liabilities (1.2) 0.9  
Net cash provided by operating activities 27.3 24.5  
Investing activities:      
Proceeds from disposition of property, plant, equipment, and other assets 23.9 20.6  
Proceeds from sale of storage tanks business 2.0 0.0  
Capital expenditures (44.4) (25.9)  
Acquisitions, net of cash acquired (15.6) 0.0  
Net cash required by investing activities (34.1) (5.3)  
Financing activities:      
Payments to retire debt (1.9) (1.0)  
Dividends paid to common stockholders (2.4) (2.4)  
Purchase of shares to satisfy employee tax on vested stock (0.1) (0.1)  
Net cash required by financing activities (4.4) (3.5)  
Net increase (decrease) in cash and cash equivalents (11.2) 15.7  
Cash and cash equivalents at beginning of period 160.4 72.9 $ 72.9
Cash and cash equivalents at end of period $ 149.2 [1] $ 88.6 $ 160.4
[1] (unaudited)