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Non-Controlling Interests (Details) (USD $)
In Millions, unless otherwise specified
1 Months Ended 3 Months Ended 12 Months Ended
May 31, 2014
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
Adjustments to net income attributable to MTI [Abstract]                        
Net income attributable to MTI   $ 21.3us-gaap_NetIncomeLoss $ 37.0us-gaap_NetIncomeLoss $ 18.5us-gaap_NetIncomeLoss $ 15.6us-gaap_NetIncomeLoss $ 22.6us-gaap_NetIncomeLoss $ 21.9us-gaap_NetIncomeLoss $ 17.1us-gaap_NetIncomeLoss $ 18.7us-gaap_NetIncomeLoss $ 92.4us-gaap_NetIncomeLoss $ 80.3us-gaap_NetIncomeLoss $ 74.1us-gaap_NetIncomeLoss
Transfer from non-controlling interest [Abstract]                        
Decrease in additional paid-in capital for purchase of the remaining non-controlling interest in CETCO India                   (2.1)us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent 0us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent 0us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent
Change from net income attributable to MTI and transfers from non-controlling interest                   90.3us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangeDueToNetIncomeAttributableToParentAndEffectsOfChangesNet 80.3us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangeDueToNetIncomeAttributableToParentAndEffectsOfChangesNet 74.1us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangeDueToNetIncomeAttributableToParentAndEffectsOfChangesNet
Percentage of noncontrolling interest acquired during the period (in hundredths) 20.00%mtx_PercentageOfNoncontrollingInterestAcquiredByParent                      
Payments to non-controlling interests $ 2.0us-gaap_PaymentsToMinorityShareholders                 $ 2.1us-gaap_PaymentsToMinorityShareholders $ 0us-gaap_PaymentsToMinorityShareholders $ 0us-gaap_PaymentsToMinorityShareholders