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Uncategorized Items
1/1/2014
USD ($)
[us-gaap_GoodwillGross]
 539,300,000 224,700,000
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AmericasMember		 13,300,000
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AsiaPacificMember		 301,300,000
/ us-gaap_StatementBusinessSegmentsAxis
= wts_EuropeMiddleEastAndAfricaMember
[us-gaap_GoodwillImpairedAccumulatedImpairmentLoss]
 (24,500,000) 24,500,000
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AmericasMember