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Segment and Related Information, Sales By Region Category (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 28, 2014
Jun. 29, 2014
Mar. 30, 2014
Dec. 31, 2013
Sep. 29, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net Sales $ 516.0us-gaap_SalesRevenueNet $ 543.5us-gaap_SalesRevenueNet $ 421.1us-gaap_SalesRevenueNet $ 244.4us-gaap_SalesRevenueNet $ 256.8us-gaap_SalesRevenueNet $ 254.2us-gaap_SalesRevenueNet $ 256.8us-gaap_SalesRevenueNet $ 250.4us-gaap_SalesRevenueNet $ 1,725.0us-gaap_SalesRevenueNet $ 1,018.2us-gaap_SalesRevenueNet $ 996.8us-gaap_SalesRevenueNet
Long-lived assets 2,165.1us-gaap_NoncurrentAssets       372.7us-gaap_NoncurrentAssets       2,165.1us-gaap_NoncurrentAssets 372.7us-gaap_NoncurrentAssets 386.6us-gaap_NoncurrentAssets
Portion of consolidated net sales that no individual foreign country's sales exceed (in hundredths)                 10.00%mtx_PortionOfConsolidatedNetSalesThatNoIndividualForeignCountrysSalesExceed    
Portion of consolidated long-lived assets that no individual foreign country's long-lived assets exceed (in hundredths)         10.00%mtx_PortionOfConsolidatedLongLivedAssetsThatNoIndividualForeignCountrysLongLivedAssetsExceed         10.00%mtx_PortionOfConsolidatedLongLivedAssetsThatNoIndividualForeignCountrysLongLivedAssetsExceed  
United States [Member] | Reportable Geographical Components [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net Sales                 1,004.4us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= mtx_UnitedStatesMember
563.5us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= mtx_UnitedStatesMember
562.5us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= mtx_UnitedStatesMember
Long-lived assets 1,865.2us-gaap_NoncurrentAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= mtx_UnitedStatesMember
      235.2us-gaap_NoncurrentAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= mtx_UnitedStatesMember
      1,865.2us-gaap_NoncurrentAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= mtx_UnitedStatesMember
235.2us-gaap_NoncurrentAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= mtx_UnitedStatesMember
235.8us-gaap_NoncurrentAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= mtx_UnitedStatesMember
Canada/Latin America [Member] | Reportable Geographical Components [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net Sales                 90.2us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= mtx_CanadaLatinAmericaMember
70.3us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= mtx_CanadaLatinAmericaMember
72.5us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= mtx_CanadaLatinAmericaMember
Long-lived assets 18.8us-gaap_NoncurrentAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= mtx_CanadaLatinAmericaMember
      12.1us-gaap_NoncurrentAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= mtx_CanadaLatinAmericaMember
      18.8us-gaap_NoncurrentAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= mtx_CanadaLatinAmericaMember
12.1us-gaap_NoncurrentAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= mtx_CanadaLatinAmericaMember
14.5us-gaap_NoncurrentAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= mtx_CanadaLatinAmericaMember
Europe/Africa [Member] | Reportable Geographical Components [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net Sales                 407.7us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= mtx_EuropeAfricaMember
269.2us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= mtx_EuropeAfricaMember
248.2us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= mtx_EuropeAfricaMember
Long-lived assets 136.8us-gaap_NoncurrentAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= mtx_EuropeAfricaMember
      64.9us-gaap_NoncurrentAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= mtx_EuropeAfricaMember
      136.8us-gaap_NoncurrentAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= mtx_EuropeAfricaMember
64.9us-gaap_NoncurrentAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= mtx_EuropeAfricaMember
69.0us-gaap_NoncurrentAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= mtx_EuropeAfricaMember
Asia [Member] | Reportable Geographical Components [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net Sales                 222.7us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= mtx_SegmentGeographicalGroupsOfCountriesGroupThreeMember
115.2us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= mtx_SegmentGeographicalGroupsOfCountriesGroupThreeMember
113.6us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= mtx_SegmentGeographicalGroupsOfCountriesGroupThreeMember
Long-lived assets 144.3us-gaap_NoncurrentAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= mtx_SegmentGeographicalGroupsOfCountriesGroupThreeMember
      60.5us-gaap_NoncurrentAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= mtx_SegmentGeographicalGroupsOfCountriesGroupThreeMember
      144.3us-gaap_NoncurrentAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= mtx_SegmentGeographicalGroupsOfCountriesGroupThreeMember
60.5us-gaap_NoncurrentAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= mtx_SegmentGeographicalGroupsOfCountriesGroupThreeMember
67.3us-gaap_NoncurrentAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= mtx_SegmentGeographicalGroupsOfCountriesGroupThreeMember
Total International [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net Sales                 720.6us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= mtx_TotalInternationalMember
454.7us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= mtx_TotalInternationalMember
434.3us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= mtx_TotalInternationalMember
Long-lived assets $ 299.9us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= mtx_TotalInternationalMember
      $ 137.5us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= mtx_TotalInternationalMember
      $ 299.9us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= mtx_TotalInternationalMember
$ 137.5us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= mtx_TotalInternationalMember
$ 150.8us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= mtx_TotalInternationalMember