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Commitments and Contingencies - Additional Information (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract] |
Term of guarantees | 1 year
Payments required to be made under guarantees, maximum | $ 8.0

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- Definition Represents the term of guarantees. + References No definition available. + Details
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Namespace Prefix: | mli_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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