Commitments and Contingencies (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended	12 Months Ended			36 Months Ended
	Oct. 31, 2012	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012	Dec. 27, 2014	Dec. 25, 2010	Jun. 21, 2011
Site Contingency [Line Items]
Environmental expense		$ 1.2	$ 1.0	$ 3.1
Environmental reserves		22.7	23.6		22.7
Expected environmental expenditures for 2015		0.7			0.7
Expected environmental expenditures for 2016		0.8			0.8
Expected environmental expenditures for 2017		0.7			0.7
Expected environmental expenditures for 2018		0.7			0.7
Expected environmental expenditures for 2019		0.8			0.8
Expected environmental expenditures after 2019		9.4			9.4
Gain Contingencies [Line Items]
Proceeds from legal settlements	5.8
Consulting Agreement [Member]
Long-term Purchase Commitment [Line Items]
Consulting agreement term (in years)		6 years
Initial period of the consulting agreement		4 years
Initial period rate of pay based on final base compensation (in hundredths)		two-thirds
Final period of the consulting agreement		2 years
Final period rate of pay of based on final base compensation (in hundredths)		one-third
Remaining amount payable under the Consulting agreement		2.7			2.7
Facilities Vehicles and Equipment [Member]
Operating Leased Assets [Line Items]
Lease payments scheduled for 2015		6.2			6.2
Lease payments scheduled for 2016		3.9			3.9
Lease payments scheduled for 2017		2.6			2.6
Lease payments scheduled for 2018		2.1			2.1
Lease payments scheduled for 2019		0.4			0.4
Lease expense		9.8	9.1	8.5
Insurance Settlement [Member] | Fulton, Mississippi [Member]
Gain Contingencies [Line Items]
Pre-tax gain from settlement				1.5		1.5
Insurance Settlement [Member] | Wynne, Arkansas [Member]
Gain Contingencies [Line Items]
Insurance settlement proceeds			127.3
Insurance claim deductible amount			0.5
Pre-tax gain from settlement			106.3
Pre-tax gain from settlement (in dollars per share)			$ 1.17
Proceeds from insurance company received			62.3	55.0
United States Department of Commerce Antidumping Review [Member]
Loss Contingencies [Line Items]
Assignment of antidumping duty rate on U.S. imports by Company subsidiaries (in hundredths)							19.80%
Reserve established		1.1			1.1
Operating Properties [Member] | Mueller Copper Tube Products, Inc. [Member]
Site Contingency [Line Items]
Mitigation estimates minimum		0.8
Mitigation estimates maximum		1.3
Estimated number of years until mitigation resolution		10 years
Non-Operating Properties [Member] | Southeast Kansas Sites [Member]
Site Contingency [Line Items]
Environmental reserves		9.5			9.5
Number of parties involved in settlement negotiations		2			2
Non-Operating Properties [Member] | Shasta Area Mine Sites [Member]
Site Contingency [Line Items]
Environmental spending					1.7
Period of permit, implementation of Best Management Practices		10 years
Mitigation estimates minimum		10.5
Mitigation estimates maximum		13.0
Estimated number of years until mitigation resolution		20 years
Non-Operating Properties [Member] | Lead Refinery Site [Member]
Site Contingency [Line Items]
Environmental expense		0.1	0.1	0.1
Number of parties involved in settlement negotiations		3			3
Mitigation estimates minimum		1.9
Mitigation estimates maximum		3.6
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		300