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Revenue Recognition - Contract Liabilities (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 01, 2018	Jan. 01, 2018
Contract Assets
Contract Assets	$ 1.7	$ 0.6
Increase - Assets	1.1
Contract Liabilities
Contract Liabilities - Current	11.5	11.3
Increase - Current Liabilities	0.2
Current Liabilities - Noncurrent	2.4	$ 2.1
Increase - Noncurrent Liabilities	0.3
Impairment loss related to Contract Assets	$ 0.0

X

- Definition

Amount of impairment loss for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

No definition available.

+ Details

Name:	wts_CapitalizedContractCostImpairmentLoss
Namespace Prefix:	wts_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

+ References

No definition available.

+ Details

Name:	wts_ContractWithCustomerAssetNet
Namespace Prefix:	wts_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	wts_ContractWithCustomerAssetNetAbstract
Namespace Prefix:	wts_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of increase in assets associated with contracts with customers where performance precedes contractual due date.

+ References

No definition available.

+ Details

Name:	wts_ContractWithCustomerAssetsIncrease
Namespace Prefix:	wts_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of increase in current contract liabilities based on timing of payments received from customers.

+ References

No definition available.

+ Details

Name:	wts_ContractWithCustomerCurrentLiabilityIncrease
Namespace Prefix:	wts_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of increase in non-current contract liabilities based on timing of payments received from customers.

+ References

No definition available.

+ Details

Name:	wts_ContractWithCustomerNoncurrentLiabilityIncrease
Namespace Prefix:	wts_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	wts_Contractwithcustomerliabilityabstract
Namespace Prefix:	wts_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration