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Goodwill and Other Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 29, 2015
Dec. 31, 2014
Goodwill and Other Intangible Assets [Abstract]    
Goodwill $ 768.3us-gaap_Goodwill [1] $ 770.9us-gaap_Goodwill [2]
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 223.6us-gaap_FiniteLivedIntangibleAssetsGross 223.6us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated Amortization 13.4us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization 11.5us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Trade Names [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 191.2us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
191.2us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
Accumulated Amortization 5.1us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
3.7us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
Technology [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 18.7us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TechnologyBasedIntangibleAssetsMember
18.7us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TechnologyBasedIntangibleAssetsMember
Accumulated Amortization 1.4us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TechnologyBasedIntangibleAssetsMember
1.0us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TechnologyBasedIntangibleAssetsMember
Patents & Trademarks [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 6.4us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= mtx_PatentsAndTrademarksMember
6.4us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= mtx_PatentsAndTrademarksMember
Accumulated Amortization 4.1us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= mtx_PatentsAndTrademarksMember
4.0us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= mtx_PatentsAndTrademarksMember
Customer Relationships [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 4.4us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
4.4us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Accumulated Amortization 0.1us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
0.1us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Customer Lists [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 2.9us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
2.9us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
Accumulated Amortization 2.7us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
2.7us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
Acquired Finite-Lived Intangible Assets [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted average amortization period for acquired intangible assets subject to amortization 28 years  
Estimated amortization expense, 2015 7.9us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= mtx_AcquiredFiniteLivedIntangibleAssetsMember
 
Estimated amortization expense, 2016 7.9us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= mtx_AcquiredFiniteLivedIntangibleAssetsMember
 
Estimated amortization expense, 2017 7.7us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= mtx_AcquiredFiniteLivedIntangibleAssetsMember
 
Estimated amortization expense, 2018 7.5us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= mtx_AcquiredFiniteLivedIntangibleAssetsMember
 
Estimated amortization expense, 2019 7.5us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= mtx_AcquiredFiniteLivedIntangibleAssetsMember
 
Estimated amortization expense, 2020 7.5us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= mtx_AcquiredFiniteLivedIntangibleAssetsMember
 
Estimated amortization expense, thereafter $ 164.2us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= mtx_AcquiredFiniteLivedIntangibleAssetsMember
 
[1] Unaudited
[2] Condensed from audited financial statements