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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 9 Months Ended
Sep. 30, 2024
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 millionsSeptember 30
2024		December 31
2023		September 30
2023
Finished products$505.9 $494.4 $448.1 
Raw materials62.2 51.2 50.5 
Products in process11.1 6.5 8.6 
Operating supplies and other68.5 63.5 63.4 
Total inventories$647.7 $615.6 $570.6 
Schedule of Results from Discontinued Operations Results from discontinued operations are as follows:
in millionsThree Months Ended
September 30		Nine Months Ended
September 30
2024202320242023
Pretax loss$(1.8)$(3.8)$(6.8)$(11.7)
Income tax benefit 0.5 1.0 1.8 3.1 
Loss on discontinued operations, net of tax$(1.3)$(2.8)$(5.0)$(8.6)
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
September 30		Nine Months Ended
September 30
in millions2024202320242023
Weighted-average common shares outstanding132.2133.0132.3133.1
Dilutive effect of
Stock-Only Stock Appreciation Rights0.20.20.20.2
Other stock compensation awards0.60.50.60.4
Weighted-average common shares outstanding, assuming dilution133.0133.7133.1133.7
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
September 30		Nine Months Ended
September 30
in millions2024202320242023
Antidilutive common stock equivalents0.10.00.10.1