Reportable Business Segments (Net Sales and Segment Profit (Loss) and Reconciliation to Income from Continuing Operations) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Profit (Loss)
Total segment profit	$ 354,000,000.0	$ 318,500,000	$ 509,600,000	$ 485,300,000
Reconciliation to Operating income:
Restructuring charges	0	0	0	0
Gain on sale from previous dispositions	0	1,600,000	0	1,600,000
Operating income	354,000,000.0	320,100,000	509,600,000	486,900,000
Pension settlements	100,000	300,000	200,000	300,000
Interest Expense, Operating and Nonoperating	8,300,000	12,500,000	14,500,000	24,300,000
Other Nonoperating Income (Expense)	600,000	300,000	1,500,000	1,100,000
Net income before income taxes	$ 345,000,000.0	$ 307,000,000.0	$ 493,400,000	$ 461,200,000