Contingencies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Contingencies
Recovery of direct costs	$ 47.2
Environmental liabilities	$ 23.3	$ 2.5
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
Proceeds from legal settlements	$ 62.2	$ 0.0	$ 12.5
Huntsville Site
Contingencies
Environmental remediation expense	8.7
Project expenditures, low estimate	5.7
Project expenditures, high estimate	17.4
Norco Site | Remediation project management regulatory oversight and investigative and feasibility studies
Contingencies
Environmental remediation expense	83.1
Project expenditures, low estimate	22.1
Project expenditures, high estimate	$ 38.3