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Consolidated Statements of Stockholders' Equity (USD $) In Millions, except Share data, unless otherwise specified | Class A Common Stock | Class B Common Stock | Additional Paid-In Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Total
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Balance at Dec. 31, 2011 | $ 2.9 us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 0.7 us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 420.1 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 515.1 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (19.0)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 919.8 us-gaap_StockholdersEquity
Balance (in shares) at Dec. 31, 2011 | 29,471,414 us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 6,953,680 us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net Income |  |  |  | 68.4 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 68.4 us-gaap_NetIncomeLoss
Other comprehensive (loss) income |  |  |  |  | 8.2 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 8.2 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income (loss) |  |  |  |  |  | 76.6 us-gaap_ComprehensiveIncomeNetOfTax
Shares of Class B common stock converted to Class A common stock | 0.1 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (0.1)us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Shares of Class B common stock converted to Class A common stock (in shares) | 365,000 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (365,000)us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Shares of Class A common stock issued upon the exercise of stock options | 0.1 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 17.7 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 17.8 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Shares of Class A common stock issued upon the exercise of stock options (in shares) | 589,798 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Stock-based compensation |  |  | 6.6 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 6.6 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Stock repurchase | (0.2)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | (65.6)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (65.8)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
Stock repurchase (in shares) | (2,000,000)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Issuance of net shares of restricted Class A common stock |  |  |  | (0.8)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (0.8)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
Issuance of net shares of restricted Class A common stock (in shares) | 141,767 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Net change in restricted stock units |  |  | 4.3 wts_IncreaseDecreaseInValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (3.0)wts_IncreaseDecreaseInValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 1.3 wts_IncreaseDecreaseInValueRestrictedStockAwardNetOfForfeitures
Net change in restricted stock units (in shares) | 105,660 wts_IncreaseDecreaseInSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Common stock dividends |  |  |  | (16.0)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (16.0)us-gaap_DividendsCommonStock
Balance at Dec. 31, 2012 | 2.9 us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0.6 us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 448.7 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 498.1 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (10.8)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 939.5 us-gaap_StockholdersEquity
Balance (in shares) at Dec. 31, 2012 | 28,673,639 us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 6,588,680 us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net Income |  |  |  | 58.6 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 58.6 us-gaap_NetIncomeLoss
Other comprehensive (loss) income |  |  |  |  | 22.8 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 22.8 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income (loss) |  |  |  |  |  | 81.4 us-gaap_ComprehensiveIncomeNetOfTax
Shares of Class B common stock converted to Class A common stock (in shares) | 99,390 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (99,390)us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Shares of Class A common stock issued upon the exercise of stock options |  |  | 11.9 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 11.9 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Shares of Class A common stock issued upon the exercise of stock options (in shares) | 361,094 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Stock-based compensation |  |  | 9.6 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 9.6 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Stock repurchase |  |  |  | (23.0)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (23.0)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
Stock repurchase (in shares) | (453,880)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Issuance of net shares of restricted Class A common stock |  |  |  | (1.6)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (1.6)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
Issuance of net shares of restricted Class A common stock (in shares) | 75,592 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Net change in restricted stock units |  |  | 3.3 wts_IncreaseDecreaseInValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (1.3)wts_IncreaseDecreaseInValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 2.0 wts_IncreaseDecreaseInValueRestrictedStockAwardNetOfForfeitures
Net change in restricted stock units (in shares) | 68,944 wts_IncreaseDecreaseInSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Common stock dividends |  |  |  | (17.7)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (17.7)us-gaap_DividendsCommonStock
Balance at Dec. 31, 2013 | 2.9 us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0.6 us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 473.5 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 513.1 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 12.0 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 1,002.1 us-gaap_StockholdersEquity
Balance (in shares) at Dec. 31, 2013 | 28,824,779 us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 6,489,290 us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net Income |  |  |  | 50.3 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 50.3 us-gaap_NetIncomeLoss
Other comprehensive (loss) income |  |  |  |  | (101.1)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (101.1)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income (loss) |  |  |  |  |  | (50.8)us-gaap_ComprehensiveIncomeNetOfTax
Shares of Class B common stock converted to Class A common stock (in shares) | 10,000 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (10,000)us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Shares of Class A common stock issued upon the exercise of stock options |  |  | 11.8 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 11.8 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Shares of Class A common stock issued upon the exercise of stock options (in shares) | 338,841 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Stock-based compensation |  |  | 8.6 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 8.6 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Stock repurchase |  |  |  | (39.6)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (39.6)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
Stock repurchase (in shares) | (669,681)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Issuance of net shares of restricted Class A common stock |  |  |  | (1.6)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (1.6)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
Issuance of net shares of restricted Class A common stock (in shares) | 12,655 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Net change in restricted stock units |  |  | 3.5 wts_IncreaseDecreaseInValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (1.1)wts_IncreaseDecreaseInValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 2.4 wts_IncreaseDecreaseInValueRestrictedStockAwardNetOfForfeitures
Net change in restricted stock units (in shares) | 35,471 wts_IncreaseDecreaseInSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Common stock dividends |  |  |  | (20.5)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (20.5)us-gaap_DividendsCommonStock
Balance at Dec. 31, 2014 | $ 2.9 us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 0.6 us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 497.4 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 500.6 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (89.1)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 912.4 us-gaap_StockholdersEquity
Balance (in shares) at Dec. 31, 2014 | 28,552,065 us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 6,479,290 us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |

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