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Consolidated Statements of Cash Flows (unaudited) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Operating activities:          
Net income $ 35.5 $ 32.0 $ 132.1 $ 91.2  
Adjustments to reconcile net income to net cash provided by operating activities:          
Depreciation, depletion, and amortization     118.8 116.9  
Stock-based compensation expense     18.3 15.5  
Provision for deferred income taxes     14.0 19.7  
Gains on disposition of property, plant, equipment, and other assets (2.6) (1.7) (25.8) (6.5)  
Gain on sale of storage tanks business 0.0 0.0 (6.4) 0.0 $ (189.0)
(Increase) decrease in other assets     (3.5) 2.3  
Increase (decrease) in other liabilities     (6.2) (18.7)  
Other     1.3 (3.6)  
Changes in current assets and liabilities:          
(Increase) decrease in receivables     (34.6) (52.0)  
(Increase) decrease in inventories     (40.4) (39.1)  
(Increase) decrease in other current assets     1.0 (3.0)  
Increase (decrease) in accounts payable     49.5 57.9  
Increase (decrease) in advance billings     (4.1) (2.6)  
Increase (decrease) in accrued liabilities     (15.2) 4.6  
Net cash provided by operating activities     198.8 182.6  
Investing activities:          
Proceeds from disposition of property, plant, equipment, and other assets     30.1 31.5  
Proceeds from sale of storage tanks business     2.0 0.0  
Capital expenditures     (144.8) (85.9)  
Acquisitions, net of cash acquired     (18.8) (75.1)  
Net cash required by investing activities     (131.5) (129.5)  
Financing activities:          
Payments to retire debt     (142.0) (59.8)  
Proceeds from issuance of debt     100.0 80.0  
Shares repurchased     0.0 (15.0)  
Dividends paid to common stockholders     (7.3) (7.4)  
Purchase of shares to satisfy employee tax on vested stock     (11.1) (9.8)  
Holdback payment from acquisition     (10.0) 0.0  
Debt issuance costs     (2.0) 0.0  
Net cash required by financing activities     (72.4) (12.0)  
Net increase (decrease) in cash and cash equivalents     (5.1) 41.1  
Cash and cash equivalents at beginning of period     160.4 72.9 72.9
Cash and cash equivalents at end of period $ 155.3 [1] $ 114.0 $ 155.3 [1] $ 114.0 $ 160.4
[1] (unaudited)