Commitments and Contingencies (Details)		1 Months Ended			6 Months Ended	12 Months Ended	18 Months Ended
	Jul. 13, 2018 USD ($)	Nov. 30, 2018 USD ($)	Jan. 31, 2018 USD ($) unilateral_administrative_order	Nov. 27, 2015 USD ($)	Jun. 29, 2019 USD ($) property	Oct. 31, 2008 Import_entry	Jun. 29, 2019 USD ($)	Jun. 29, 2019 smelter_site	Jun. 29, 2019 potentially_responsible_party	Nov. 08, 2016 USD ($)	Apr. 19, 2010
Loss Contingencies [Line Items]
Term of guarantees					1 year
Payments required to be made under guarantees, maximum					$ 11,900,000		$ 11,900,000
United States Department of Commerce Antidumping Review [Member]
Loss Contingencies [Line Items]
Assignment of antidumping duty rate on U.S. imports by Company subsidiaries											48.33%
Payment for interest and duties				$ 3,000,000.0
Number of import entries | Import_entry						795
Unlawful Employment Practices [Member]
Loss Contingencies [Line Items]
Term of consent decree	2 years 6 months
Maximum amount to be paid to fund discrimination claims	$ 1,000,000.0
Deepwater Horizon Economic and Property Damage Claim [Member]
Loss Contingencies [Line Items]
Amount awarded to the Company		$ 27,400,000
Gain contingency, legal and advisory fees, percent of total award amount		20.00%
Southeast Kansas Sites [Member] | Non operating Properties [Member]
Loss Contingencies [Line Items]
Number of parties involved in settlement negotiations								3	2
Environmental reserves					$ 5,600,000		5,600,000
Shasta Area Mine Sites [Member] | Non operating Properties [Member]
Loss Contingencies [Line Items]
Period of permit, implementation of Best Management Practices					10 years
Estimated remediation costs, term					30 years
Lead Refinery Site [Member]
Loss Contingencies [Line Items]
Financial guarantee										$ 1,000,000.0
Lead Refinery Site [Member] | Non operating Properties [Member]
Loss Contingencies [Line Items]
Number of parties involved in settlement negotiations | potentially_responsible_party									2
Estimated remediation costs, term					18 years
Amount other PRPs will pay to fund cleanup					$ 26,000,000.0
Number of surrounding properties | property					300
Lead Refinery NPL Site [Member]
Loss Contingencies [Line Items]
Environmental reserves			$ 4,500,000
Number of UAOs | unilateral_administrative_order			2
Site contingency, total costs			$ 25,000,000.0
Site contingency, amount agreed upon to pay PRPs for past costs			2,000,000.0
Site contingency, additional reimbursement of past costs			$ 700,000
Site contingency, amount paid to date for reimbursement of costs							$ 400,000
Contingency charge					$ 7,000,000.0
Mueller Copper Tube Products, Inc. [Member] | Operating Properties [Member]
Loss Contingencies [Line Items]
Estimated remediation costs, term					7 years
Minimum [Member] | Shasta Area Mine Sites [Member] | Non operating Properties [Member]
Loss Contingencies [Line Items]
Estimated remediation costs					$ 12,800,000
Minimum [Member] | Lead Refinery Site [Member] | Non operating Properties [Member]
Loss Contingencies [Line Items]
Estimated remediation costs					1,700,000
Minimum [Member] | Mueller Copper Tube Products, Inc. [Member] | Operating Properties [Member]
Loss Contingencies [Line Items]
Estimated remediation costs					700,000
Maximum [Member] | Shasta Area Mine Sites [Member] | Non operating Properties [Member]
Loss Contingencies [Line Items]
Estimated remediation costs					17,500,000
Maximum [Member] | Lead Refinery Site [Member] | Non operating Properties [Member]
Loss Contingencies [Line Items]
Estimated remediation costs					2,100,000
Maximum [Member] | Mueller Copper Tube Products, Inc. [Member] | Operating Properties [Member]
Loss Contingencies [Line Items]
Estimated remediation costs					$ 1,100,000