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CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Unaudited) (Parenthetical) - USD ($)
shares in Millions, $ in Millions
Sep. 30, 2024
Dec. 31, 2023
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 1.5 $ 1.1
Property, plant and equipment, accumulated depreciation $ 403.7 $ 385.7
Capital stock, par value (in dollars per share) $ 1 $ 1
Capital stock, authorized shares (in shares) 50.0 50.0
Capital stock, shares issued (in shares) 18.6 18.6
Capital stock, shares outstanding (in shares) 18.6 18.6