Consolidated Balance Sheets (Parenthetical) - USD ($)	Mar. 31, 2026	Dec. 31, 2025
Current Assets:
Allowances, accounts and notes receivable	$ 9,100,000	$ 8,500,000
Accumulated depreciation	1,064,300,000	1,043,900,000
Accumulated amortization	$ 42,400,000	$ 38,300,000
Stockholders' equity:
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	25,000,000	25,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	87,170,197	87,170,197
Treasury stock, shares	52,360,280	52,374,147