XML 22 R43.htm IDEA: XBRL DOCUMENT v2.4.1.9
Contingencies and Environmental Remediation (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 29, 2015
item
Litigation contingencies  
Reasonably possible loss in excess of the amount accrued for its legal contingencies 6.4us-gaap_LossContingencyRangeOfPossibleLossMaximum
Asbestos Litigation  
Litigation contingencies  
Number of lawsuits the entity is defending in different jurisdictions 250us-gaap_LossContingencyNumberOfDefendants
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= wts_AsbestosLitigationMember