Commitments and Contingencies (Details) $ in Millions	1 Months Ended					9 Months Ended	12 Months Ended
	Mar. 31, 2022 potentially_responsible_party	Feb. 28, 2022 USD ($) ft smelter_site	Jan. 31, 2018 USD ($) unilateralAdministrativeOrder potentially_responsible_party	Nov. 27, 2015 USD ($)	Aug. 31, 2015 mining_site	Sep. 30, 2023 USD ($) property potentially_responsible_party smelter_site	Oct. 31, 2008 import_entry	Dec. 25, 2021 USD ($)	Nov. 08, 2016 USD ($)	Apr. 19, 2010
Loss Contingencies [Line Items]
Term of guarantees						1 year
Payments required to be made under guarantees, maximum						$ 28.7
United States Department of Commerce Antidumping Review
Loss Contingencies [Line Items]
Assignment of antidumping duty rate on U.S. imports by Company subsidiaries (as a percent)										48.33%
Payment for interest and duties				$ 3.0
Number of import entries | import_entry							795
Southeast Kansas Sites
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies, gross		$ 5.6
Geographic boundary of sites | ft		50
Southeast Kansas Sites | Non operating Properties
Loss Contingencies [Line Items]
Number of former smelter sites | smelter_site		3				3
Number of parties involved in settlement negotiations | potentially_responsible_party						2
Southeast Kansas Sites - Lanyon | Operating Properties
Loss Contingencies [Line Items]
Number of properties in remediation | property						1,371
Number of surrounding properties | property						300
Shasta Area Mine Sites | Non operating Properties
Loss Contingencies [Line Items]
Period of permit, implementation of best management practices						10 years
Estimated remediation costs, term						30 years
Shasta Area Mine Sites | Non operating Properties | Minimum
Loss Contingencies [Line Items]
Estimated remediation costs						$ 14.1
Shasta Area Mine Sites | Non operating Properties | Maximum
Loss Contingencies [Line Items]
Estimated remediation costs						$ 16.1
Lead Refinery Site
Loss Contingencies [Line Items]
Financial guarantee									$ 1.0
Lead Refinery Site | Non operating Properties
Loss Contingencies [Line Items]
Number of parties involved in settlement negotiations | potentially_responsible_party						2
Estimated remediation costs, term						14 years
Amount other PRPs will pay to fund cleanup						$ 26.0
Number of surrounding properties | property						300
Lead Refinery Site | Non operating Properties | Minimum
Loss Contingencies [Line Items]
Estimated remediation costs						$ 1.6
Lead Refinery Site | Non operating Properties | Maximum
Loss Contingencies [Line Items]
Estimated remediation costs						2.4
Lead Refinery NPL Site
Loss Contingencies [Line Items]
Number of UAOs | unilateralAdministrativeOrder			2
Number of PRPs | potentially_responsible_party	4		4
Environmental reserves			$ 4.5
Site contingency, total costs			25.0
Site contingency, amount agreed upon to pay PRPs for past costs			2.0
Site contingency, additional reimbursement of past costs			$ 0.7
Contingency charge						$ 7.6
Reserve for settlement								$ 3.3
Bonita Peak Mining District
Loss Contingencies [Line Items]
Number of mining sites | mining_site					48
Mueller Copper Tube Products, Inc. | Operating Properties
Loss Contingencies [Line Items]
Estimated remediation costs, term						3 years
Mueller Copper Tube Products, Inc. | Operating Properties | Minimum
Loss Contingencies [Line Items]
Estimated remediation costs						$ 0.5
Mueller Copper Tube Products, Inc. | Operating Properties | Maximum
Loss Contingencies [Line Items]
Estimated remediation costs						$ 0.7