Percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
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-Paragraph 1
-Subparagraph (SX 210.4-08(f))
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-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
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+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (b)
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+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fixed adjustment to interest rate.

+ References

No definition available.

+ Details

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Namespace Prefix:	wts_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the minimum base rate to be used as the reference rate.

+ References

No definition available.

+ Details

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Namespace Prefix:	wts_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the additional amount of borrowing capacity that may be added under the credit facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	wts_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum consolidated Leverage Ratio, the ratio of (a) Consolidated Funded Indebtedness as of such date to (b) Consolidated EBITDA of the Borrower and its Subsidiaries on a Consolidated basis for the most recently completed Measurement Period.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Minimum consolidated Leverage Ratio, the ratio of (a) Consolidated Funded Indebtedness as of such date to (b) Consolidated EBITDA of the Borrower and its Subsidiaries on a Consolidated basis for the most recently completed Measurement Period.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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Debt - Credit Agreement (Details) $ in Millions		6 Months Ended
Debt - Credit Agreement (Details) $ in Millions	Mar. 30, 2021 USD ($)	Jun. 30, 2024 USD ($)	Jul. 12, 2024 USD ($)
Letters of credit
Credit Agreement
Term of debt		1 year
Subsequent event \| Revolving credit facility
Credit Agreement
Line of credit facility, option for additional borrowing capacity			$ 400.0
Potential additional borrowing capacity			$ 400.0
SOFR
Credit Agreement
Adjustment to interest rate	0.10
SOFR \| Minimum
Credit Agreement
Interest rate added to base rate (as a percent)	1.075%
SOFR \| Maximum
Credit Agreement
Interest rate added to base rate (as a percent)	1.325%
Credit Agreement
Credit Agreement
Unused and available credit under the credit agreement		$ 527.1
Credit Agreement \| Letters of credit
Credit Agreement
Borrowing capacity	$ 100.0
Stand-by letters of credit outstanding		12.9
Base rate loans and swing line loans
Credit Agreement
Minimum base rate (as a percent)	1.00
Base rate loans and swing line loans \| SOFR
Credit Agreement
Interest rate (as a percent)	1.00%
Base rate loans and swing line loans \| Prime Rate
Credit Agreement
Interest rate (as a percent)	0.50%
Revolving credit facility
Credit Agreement
Borrowing capacity	$ 800.0
Amount drawn		$ 260.0
Interest rate (as a percent)		4.63%
Weighted average interest rate (as a percent)		6.51%
Maximum consolidated leverage ratio	3.50
Minimum consolidated leverage ratio	3.50
Revolving credit facility \| Temporary Step-ups Following Acquisitions
Credit Agreement
Maximum consolidated leverage ratio	4.00
Swing Line Loans
Credit Agreement
Borrowing capacity	$ 15.0