Reportable Business Segments (Net Sales and Segment Profit (Loss) and Reconciliation to Income from Continuing Operations) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Profit (Loss)
Total segment profit	$ 310,200,000	$ 303,300,000	$ 819,800,000	$ 788,600,000
Reconciliation to Operating income:
Restructuring charges	0	0	0	0
Restructuring charges	0	0	0	1,600,000
Operating income	310,200,000	303,300,000	819,800,000	790,200,000
Pension settlements	100,000	100,000	300,000	400,000
Interest Expense, Operating and Nonoperating	10,500,000	8,900,000	25,000,000.0	33,200,000
Other Nonoperating Income (Expense)	800,000	400,000	2,300,000	1,500,000
Net income before income taxes	$ 298,800,000	$ 293,900,000	$ 792,200,000	$ 755,100,000