Reportable Business Segments (Net Sales and Segment Profit (Loss) and Reconciliation to Income from Continuing Operations) (Details) - USD ($)	3 Months Ended				12 Months Ended
	Dec. 31, 2025	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Segment Profit (Loss)
Total segment profit(1)(2)					$ 1,057,700,000	$ 1,041,900,000	$ 858,500,000
Reconciliation to Operating income:
Gain (Loss) on Disposition of Business and Related Property					(900,000)	1,500,000	(14,100,000)
Impairment charges					0	0	63,200,000
Items in (Gains) Losses and other expenses, net that are excluded from segment profit (loss)					0	0	14,800,000
Restructuring charges					6,800,000	0	3,100,000
Business Combination, Acquisition-Related Cost, Expense					10,300,000	0	0
Operating income	$ 195,800,000	$ 328,800,000	$ 349,000,000.0	$ 168,000,000.0	1,041,500,000	1,040,400,000	791,500,000
Pension settlements					400,000	400,000	800,000
Interest Expense, Operating and Nonoperating					40,900,000	38,700,000	51,700,000
Other Nonoperating Income (Expense)					3,400,000	1,900,000	100,000
Income before income taxes	$ 178,700,000	$ 317,400,000	$ 340,000,000.0	$ 160,800,000	$ 996,800,000	$ 999,400,000	$ 738,900,000