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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 3 Months Ended
Mar. 31, 2025
Accounting Policies [Abstract]  
Schedule of Inventory, Current
Inventories and supplies are stated at the lower of cost or net realizable value. Inventories are as follows:
in millionsMarch 31
2025		December 31
2024		March 31
2024
Finished products$570.3 $534.6 $512.7 
Raw materials65.7 69.7 58.7 
Products in process10.3 9.0 6.8 
Operating supplies and other74.7 68.5 69.0 
Total inventories$721.0 $681.8 $647.2 
Schedule of Results from Discontinued Operations Results from discontinued operations are as follows:
in millionsThree Months Ended
March 31
20252024
Pretax loss$(1.3)$(2.3)
Income tax benefit 0.4 0.6 
Loss on discontinued operations, net of tax$(0.9)$(1.7)
Schedule of Weighted-Average Common Shares Outstanding Assuming Dilution
Earnings per share are computed by dividing net earnings by the weighted-average common shares outstanding (basic EPS) or weighted-average common shares outstanding assuming dilution (diluted EPS), as set forth below:
Three Months Ended
March 31
in millions20252024
Weighted-average common shares outstanding132.4132.4
Dilutive effect of
Stock-Only Stock Appreciation Rights0.10.2
Other stock compensation awards0.50.5
Weighted-average common shares outstanding, assuming dilution133.0133.1
Schedule of Antidilutive Common Stock Equivalents The number of antidilutive common stock equivalents for which the exercise price exceeds the weighted-average market price is as follows:
Three Months Ended
March 31
in millions20252024
Antidilutive common stock equivalents0.10.1