Contingencies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Contingencies
Environmental liabilities	$ 26.0
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]	Accrued Liabilities, Current, Other Liabilities, Noncurrent
Environmental remediation expenses	$ 4.5	$ 0.8	$ 23.3
Environmental Remediation Expense, before Recovery, Statement of Income or Comprehensive Income [Extensible Enumeration]	Restructuring and Related Cost, Incurred Cost	Restructuring and Related Cost, Incurred Cost	Restructuring and Related Cost, Incurred Cost
Recovery of direct costs	$ 157.4
Proceeds from legal settlements			$ 62.2
Huntsville Site
Contingencies
Environmental remediation expense to date	9.5
Project expenditures, low estimate	4.9
Project expenditures, high estimate	16.6
Norco Site
Contingencies
Environmental remediation expense to date	89.1
Project expenditures, low estimate	21.1
Project expenditures, high estimate	$ 38.5