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Goodwill and Other Intangible Assets Textuals (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Amortization of Intangible Assets $ 6.5us-gaap_AmortizationOfIntangibleAssets $ 5.9us-gaap_AmortizationOfIntangibleAssets $ 7.2us-gaap_AmortizationOfIntangibleAssets
Future Amortization Expense, Year One 6.2us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths    
Future Amortization Expense, Year Two 5.7us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo    
Future Amortization Expense, Year Three 5.4us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree    
Future Amortization Expense, Year Four 5.1us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour    
Future Amortization Expense, Year Five 4.8us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive    
Amortization Of Acquired Intangible Asset Net Of Tax 5.6mtd_AmortizationOfAcquiredIntangibleAssetNetOfTax 5.3mtd_AmortizationOfAcquiredIntangibleAssetNetOfTax 6.8mtd_AmortizationOfAcquiredIntangibleAssetNetOfTax
Purchased Intangibles, Net of Tax 3.9mtd_PurchasedIntangiblesNetOfTax 3.6mtd_PurchasedIntangiblesNetOfTax 4.5mtd_PurchasedIntangiblesNetOfTax
Capitalized Computer Software, Amortization $ 22.4us-gaap_CapitalizedComputerSoftwareAmortization $ 18.6us-gaap_CapitalizedComputerSoftwareAmortization $ 13.9us-gaap_CapitalizedComputerSoftwareAmortization
Minimum [Member]      
Finite-Lived Intangible Assets, Useful Life, Minimum 3 years    
Maximum [Member]      
Finite-Lived Intangible Assets, Useful Life, Minimum 45 years