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Debt (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument    
Senior Notes $ 250,000,000us-gaap_SeniorNotes  
Total Debt, Long-term and Short-term 451,954,000us-gaap_DebtLongtermAndShorttermCombinedAmount 413,027,000us-gaap_DebtLongtermAndShorttermCombinedAmount
Less: current portion (116,164,000)mtd_ShortTermDebtAndLongTermDebtCurrentMaturities (17,067,000)mtd_ShortTermDebtAndLongTermDebtCurrentMaturities
Long-term debt 335,790,000us-gaap_LongTermDebtNoncurrent 395,960,000us-gaap_LongTermDebtNoncurrent
6.3% Senior Notes    
Debt Instrument    
Senior Notes 100,000,000us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= mtd_SeniorNotes6Point30PercentageMember
100,000,000us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= mtd_SeniorNotes6Point30PercentageMember
Senior Notes, Stated Interest Rate 6.30%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mtd_SeniorNotes6Point30PercentageMember
 
Maturity Date Jun. 25, 2015  
3.67% Percent Notes    
Debt Instrument    
Senior Notes 50,000,000us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= mtd_A367PercentSeniorNotesMember
50,000,000us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= mtd_A367PercentSeniorNotesMember
Senior Notes, Stated Interest Rate 3.67%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mtd_A367PercentSeniorNotesMember
 
Maturity Date Dec. 17, 2022  
4.10% Senior Notes [Member]    
Debt Instrument    
Senior Notes 50,000,000us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= mtd_A4.10SeniorNotesMember
50,000,000us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= mtd_A4.10SeniorNotesMember
Senior Notes, Stated Interest Rate 4.10%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mtd_A4.10SeniorNotesMember
 
Maturity Date Sep. 19, 2023  
3.84% Senior Notes [Member]    
Debt Instrument    
Senior Notes 125,000,000us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= mtd_A3.84SeniorNotesMember
0us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= mtd_A3.84SeniorNotesMember
Senior Notes, Stated Interest Rate 3.84%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mtd_A3.84SeniorNotesMember
 
Maturity Date Sep. 19, 2024  
$800 Credit Agreement    
Debt Instrument    
$800 million Credit Agreement, interest at LIBOR plus 75 basis points 110,790,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= mtd_A800CreditAgreementMember
195,960,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= mtd_A800CreditAgreementMember
Maturity Date Nov. 26, 2018  
Credit Agreement Borrowing Capacity 800,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= mtd_A800CreditAgreementMember
 
$800 million Credit Agreement, Basis Spread on Variable Rate 0.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= mtd_A800CreditAgreementMember
 
Other Local Arrangements    
Debt Instrument    
Other Local Arrangements $ 16,164,000us-gaap_OtherBorrowings
/ us-gaap_DebtInstrumentAxis
= mtd_OtherLocalArrangementsMember
$ 17,067,000us-gaap_OtherBorrowings
/ us-gaap_DebtInstrumentAxis
= mtd_OtherLocalArrangementsMember