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Contingencies and Environmental Remediation (Details) (USD $) In Millions, unless otherwise specified |  | 0 Months Ended | 9 Months Ended
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Sep. 29, 2013 | Aug. 22, 2013 Trabakoolas et al., v, Watts Water Technologies, Inc., et al. | Sep. 29, 2013 Asbestos Litigation item
Litigation contingencies |  |  |
Reasonably possible loss in excess of the amount accrued for its legal contingencies | $ 6.5 |  |
Period of stay for class action |  | 45 days |
Number of lawsuits the entity is defending in different jurisdictions |  |  | 42

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