Commitments and Contingencies (Details) $ in Millions	1 Months Ended		3 Months Ended	12 Months Ended
	Jan. 31, 2018 USD ($) potentially_responsible_party unilateral_administrative_order	Nov. 27, 2015 USD ($)	Mar. 27, 2021 USD ($) property smelter_site	Oct. 31, 2008 Import_entry	Mar. 27, 2021 potentially_responsible_party	Mar. 27, 2021 USD ($)	Feb. 12, 2020 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						$ 19.3
United States Department of Commerce Antidumping Review [Member]
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
Deepwater Horizon Economic and Property Damage Claim [Member]
Loss Contingencies [Line Items]
Amount awarded to the Company							$ 22.1
Lead Refinery Site [Member]
Loss Contingencies [Line Items]
Financial guarantee								$ 1.0
Lead Refinery NPL Site [Member]
Loss Contingencies [Line Items]
Environmental reserves	$ 4.5
Number of UAOs | unilateral_administrative_order	2
Number of PRPs | potentially_responsible_party	4
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			$ 7.5
Non operating Properties [Member] | Southeast Kansas Sites [Member]
Loss Contingencies [Line Items]
Number of parties involved in settlement negotiations			3		2
Environmental reserves						$ 5.6
Non operating Properties [Member] | Shasta Area Mine Sites [Member]
Loss Contingencies [Line Items]
Period of permit, implementation of Best Management Practices			10 years
Estimated remediation costs, term			30 years
Non operating Properties [Member] | Lead Refinery Site [Member]
Loss Contingencies [Line Items]
Number of parties involved in settlement negotiations | potentially_responsible_party					2
Estimated remediation costs, term			16 years
Amount other PRPs will pay to fund cleanup			$ 26.0
Number of surrounding properties | property			300
Non operating Properties [Member] | Minimum [Member] | Shasta Area Mine Sites [Member]
Loss Contingencies [Line Items]
Estimated remediation costs			$ 13.9
Non operating Properties [Member] | Minimum [Member] | Lead Refinery Site [Member]
Loss Contingencies [Line Items]
Estimated remediation costs			1.7
Non operating Properties [Member] | Maximum [Member] | Shasta Area Mine Sites [Member]
Loss Contingencies [Line Items]
Estimated remediation costs			18.0
Non operating Properties [Member] | Maximum [Member] | Lead Refinery Site [Member]
Loss Contingencies [Line Items]
Estimated remediation costs			$ 2.4
Operating Properties [Member] | Mueller Copper Tube Products, Inc. [Member]
Loss Contingencies [Line Items]
Estimated remediation costs, term			5 years
Operating Properties [Member] | Minimum [Member] | Mueller Copper Tube Products, Inc. [Member]
Loss Contingencies [Line Items]
Estimated remediation costs			$ 0.9
Operating Properties [Member] | Maximum [Member] | Mueller Copper Tube Products, Inc. [Member]
Loss Contingencies [Line Items]
Estimated remediation costs			$ 1.1