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Summary of Significant Accounting Policies (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 27, 2014 | Dec. 28, 2013 | Dec. 29, 2012
Principles of consolidation [Abstract] |  |  |
Non-controlling ownership interest of Mueller-Xingrong (in hundredths) | 49.50%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners |  |
Common Stock Split [Abstract] |  |  |
Conversion ratio for stock split | 2 us-gaap_StockholdersEquityNoteStockSplitConversionRatio1 |  |
Number of shares given as stock dividend for each outstanding share (in shares) | 1 mli_NumberOfSharesGivenAsStockDividendForEachOutstandingShare |  |
Cash equivalents [Abstract] |  |  |
Temporary investments | $ 144.9 mli_TemporaryInvestments | $ 179.2 mli_TemporaryInvestments |
Restricted cash | 8.1 us-gaap_RestrictedCashAndCashEquivalents | 5.2 us-gaap_RestrictedCashAndCashEquivalents |
Benefit Plans [Abstract] |  |  |
Specified percentage over which unrecognized gains and losses are amortized (in hundredths) | 10.00%mli_SpecifiedPercentageOverWhichUnrecognizedGainsAndLossesAreAmortized |  |
Average remaining service period for the pension plans | 9 years |  |
Earnings Per Share [Abstract] |  |  |
Stock-based awards excluded from the computation of diluted earnings per share (in shares) | 180,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |  |
Foreign currency translation [Abstract] |  |  |
Foreign currency transaction (losses) gains | $ 0.1 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | $ (0.1)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | $ (0.3)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Buildings [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Abstract] |  |  |
Property, plant and equipment, useful life | 20 years |  |
Buildings [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Abstract] |  |  |
Property, plant and equipment, useful life | 40 years |  |
Machinery and Equipment [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Abstract] |  |  |
Property, plant and equipment, useful life | 5 years |  |
Machinery and Equipment [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Abstract] |  |  |
Property, plant and equipment, useful life | 20 years |  |

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