Reportable Business Segments (Net Sales and Segment Profit (Loss) and Reconciliation to Income from Continuing Operations) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Reconciliation to Operating income:
Restructuring charges	$ 0.0	$ 0.0
Restructuring charges	0.0	0.0
Operating income	163.5	168.0
Pension settlements	0.5	0.1
Interest Expense, Operating and Nonoperating	15.2	6.2
Other Nonoperating Income (Expense)	0.9	0.9
Net income before income taxes	$ 146.9	$ 160.8