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Financing Arrangements (Details) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 27, 2006 | Dec. 31, 2014 | May 15, 2003 | Jun. 18, 2010 | May 31, 2010 | Dec. 31, 2013
Financing Arrangements |  |  |  |  |  |
Long-term Debt, Total |  | $ 579.7 us-gaap_LongTermDebt |  |  |  | $ 307.7 us-gaap_LongTermDebt
Less Current Maturities |  | 1.9 us-gaap_LongTermDebtCurrent |  |  |  | 2.2 us-gaap_LongTermDebtCurrent
Long-term debt, net of current portion |  | 577.8 us-gaap_LongTermDebtNoncurrent |  |  |  | 305.5 us-gaap_LongTermDebtNoncurrent
Principal payments during each of the next five years and thereafter |  |  |  |  |  |
2015 |  | 1.9 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths |  |  |  |
2016 |  | 226.3 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo |  |  |  |
2017 |  | 1.4 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree |  |  |  |
2018 |  | 0.1 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour |  |  |  |
2019 |  | 275.0 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive |  |  |  |
Thereafter |  | 75.0 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive |  |  |  |
Letters of credit outstanding |  | 23.6 us-gaap_LettersOfCreditOutstandingAmount |  |  |  | 23.6 us-gaap_LettersOfCreditOutstandingAmount
5.85% Senior notes due 2016 |  |  |  |  |  |
Financing Arrangements |  |  |  |  |  |
Interest rate (as a percent) | 5.85%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = wts_SeniorNotes5.85PercentDue2016Member | 5.85%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = wts_SeniorNotes5.85PercentDue2016Member |  |  |  |
Long-term Debt, Total |  | 225.0 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = wts_SeniorNotes5.85PercentDue2016Member |  |  |  | 225.0 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = wts_SeniorNotes5.85PercentDue2016Member
Principal amount of notes issued | 225.0 us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_LongtermDebtTypeAxis = wts_SeniorNotes5.85PercentDue2016Member |  |  |  |  |
5.85% Senior notes due 2016 | Minimum |  |  |  |  |  |
Financing Arrangements |  |  |  |  |  |
Optional amount that the Company may prepay |  | 1.0 wts_DebtInstrumentOptionalPrepayments / us-gaap_LongtermDebtTypeAxis = wts_SeniorNotes5.85PercentDue2016Member / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |
5.47% notes due May 2013 |  |  |  |  |  |
Financing Arrangements |  |  |  |  |  |
Interest rate (as a percent) |  |  | 5.47%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = wts_SeniorNotes5.47PercentDue2013Member |  |  |
Principal amount of notes issued |  |  | 75.0 us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_LongtermDebtTypeAxis = wts_SeniorNotes5.47PercentDue2013Member |  |  |
5.05% Senior notes due 2020 |  |  |  |  |  |
Financing Arrangements |  |  |  |  |  |
Interest rate (as a percent) |  | 5.05%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = wts_SeniorNotes5.05PercentDue2020Member |  | 5.05%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = wts_SeniorNotes5.05PercentDue2020Member |  | 5.05%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = wts_SeniorNotes5.05PercentDue2020Member
Long-term Debt, Total |  | 75.0 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = wts_SeniorNotes5.05PercentDue2020Member |  |  |  | 75.0 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = wts_SeniorNotes5.05PercentDue2020Member
Principal amount of notes issued |  |  |  | 75.0 us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_LongtermDebtTypeAxis = wts_SeniorNotes5.05PercentDue2020Member |  |
5.05% Senior notes due 2020 | Minimum |  |  |  |  |  |
Financing Arrangements |  |  |  |  |  |
Optional amount that the Company may prepay |  | 1.0 wts_DebtInstrumentOptionalPrepayments / us-gaap_LongtermDebtTypeAxis = wts_SeniorNotes5.05PercentDue2020Member / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |
Line of Credit matures on 2019 |  |  |  |  |  |
Financing Arrangements |  |  |  |  |  |
Long-term Debt, Total |  | 275.0 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = wts_LineOfCreditMaturitiesOnFebruary182019Member |  |  |  |
Other consists primarily of European borrowings (at interest rates ranging from 1.1% to 6.0%) |  |  |  |  |  |
Financing Arrangements |  |  |  |  |  |
Minimum interest rate (as a percent) |  | 1.10%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember |  |  |  |
Maximum interest rate (as a percent) |  | 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember |  |  |  |
Long-term Debt, Total |  | 4.7 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember |  |  |  | 7.7 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember
Senior unsecured notes |  |  |  |  |  |
Financing Arrangements |  |  |  |  |  |
Principal amount of notes issued |  |  | 125.0 us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |  |
4.87% senior notes due 2010 |  |  |  |  |  |
Financing Arrangements |  |  |  |  |  |
Interest rate (as a percent) |  |  | 4.87%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = wts_SeniorNotes4.87PercentDue2010Member |  | 4.87%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = wts_SeniorNotes4.87PercentDue2010Member |
Principal amount of notes issued |  |  | 50.0 us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_LongtermDebtTypeAxis = wts_SeniorNotes4.87PercentDue2010Member |  |  |
Debt repaid |  |  |  |  | $ 50.0 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_LongtermDebtTypeAxis = wts_SeniorNotes4.87PercentDue2010Member |
Letters of credit |  |  |  |  |  |
Financing Arrangements |  |  |  |  |  |
Term of letters of credit from the date of issuance |  | 1 year |  |  |  |

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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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