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Commitments and Contingencies, Environmental (Details)
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
Party
Property
Dec. 26, 2015
USD ($)
Dec. 27, 2014
USD ($)
Site Contingency [Line Items]      
Environmental expense $ 0.9 $ 0.1 $ 1.2
Environmental reserves 21.9 $ 21.7  
Expected environmental expenditures for 2017 0.7    
Expected environmental expenditures for 2018 0.6    
Expected environmental expenditures for 2019 0.6    
Expected environmental expenditures for 2020 0.7    
Expected environmental expenditures for 2021 0.7    
Expected environmental expenditures after 2021 $ 18.6    
Operating Properties [Member] | Mueller Copper Tube Products, Inc. [Member]      
Site Contingency [Line Items]      
Estimated number of years until mitigation resolution 9 years    
Operating Properties [Member] | Mueller Copper Tube Products, Inc. [Member] | Minimum [Member]      
Site Contingency [Line Items]      
Mitigation estimates $ 0.9    
Operating Properties [Member] | Mueller Copper Tube Products, Inc. [Member] | Maximum [Member]      
Site Contingency [Line Items]      
Mitigation estimates 1.4    
Non-Operating Properties [Member] | Southeast Kansas Sites [Member]      
Site Contingency [Line Items]      
Environmental reserves $ 5.6    
Number of parties involved in settlement negotiations | Party 2    
Non-Operating Properties [Member] | Shasta Area Mine Sites [Member]      
Site Contingency [Line Items]      
Environmental spending $ 1.2    
Period of permit, implementation of Best Management Practices 10 years    
Estimated number of years until mitigation resolution 30 years    
Non-Operating Properties [Member] | Shasta Area Mine Sites [Member] | Minimum [Member]      
Site Contingency [Line Items]      
Mitigation estimates $ 13.2    
Non-Operating Properties [Member] | Shasta Area Mine Sites [Member] | Maximum [Member]      
Site Contingency [Line Items]      
Mitigation estimates 20.9    
Non-Operating Properties [Member] | Lead Refinery Site [Member]      
Site Contingency [Line Items]      
Environmental expense $ 0.5    
Number of parties involved in settlement negotiations | Party 3    
Estimated number of years until mitigation resolution 20 years    
Lead Refinery Site [Abstract]      
EPA's estimated cost of site remediation $ 26.0    
Number of surrounding properties | Property 300    
Non-Operating Properties [Member] | Lead Refinery Site [Member] | Minimum [Member]      
Site Contingency [Line Items]      
Mitigation estimates $ 2.1    
Non-Operating Properties [Member] | Lead Refinery Site [Member] | Maximum [Member]      
Site Contingency [Line Items]      
Mitigation estimates $ 4.7