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Debt (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 29, 2015
Credit Agreement  
Credit Agreement  
Multi-currency borrowing capacity $ 500us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
Term of senior unsecured revolving credit facility 5 years
Potential additional borrowing capacity 500wts_LineOfCreditFacilityOptionForAdditionalBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
Sublimit on letters of credit 100wts_LettersOfCreditMaximumAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
Unused and available credit under the credit agreement 200.1us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
Stand-by letters of credit outstanding 24.9us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
Long-term Line of Credit $ 275us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
Eurocurrency rate loans | LIBOR  
Credit Agreement  
Variable interest rate basis LIBOR
Eurocurrency rate loans | LIBOR | Minimum  
Credit Agreement  
Interest rate added to base rate (as a percent) 0.975%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= wts_EurocurrencyRateLoansMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
Eurocurrency rate loans | LIBOR | Maximum  
Credit Agreement  
Interest rate added to base rate (as a percent) 1.45%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= wts_EurocurrencyRateLoansMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
Base rate loans and swing line loans | LIBOR  
Credit Agreement  
Interest rate added to base rate (as a percent) 1.00%wts_DebtInstrumentBasisSpreadOnVariableRateAdditional
/ us-gaap_DebtInstrumentAxis
= wts_BaseRateAndSwingLineLoansMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
Variable interest rate basis LIBOR
Base rate loans and swing line loans | LIBOR | Minimum  
Credit Agreement  
Interest rate added to base rate (as a percent) 0.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= wts_BaseRateAndSwingLineLoansMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
Base rate loans and swing line loans | LIBOR | Maximum  
Credit Agreement  
Interest rate added to base rate (as a percent) 0.45%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= wts_BaseRateAndSwingLineLoansMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
Base rate loans and swing line loans | Federal funds  
Credit Agreement  
Interest rate added to base rate (as a percent) 0.50%wts_DebtInstrumentBasisSpreadOnVariableRateAdditional
/ us-gaap_DebtInstrumentAxis
= wts_BaseRateAndSwingLineLoansMember
/ us-gaap_VariableRateAxis
= wts_DebtInstrumentVariableRateBaseFederalFundsMember
Variable interest rate basis federal funds rate
Base rate loans and swing line loans | Prime Rate  
Credit Agreement  
Variable interest rate basis prime rate