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Contingencies and Environmental Remediation (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	9 Months Ended
	Dec. 12, 2013	Sep. 28, 2014	Dec. 31, 2013
Litigation contingencies
Reasonably possible loss in excess of the amount accrued for its legal contingencies		$ 5.8
Trabakoolas et al., v, Watts Water Technologies, Inc., et al.
Litigation contingencies
Total settlement amount	23.0
Possible loss	14.0
Insurance proceeds	9.0	9.0
Liability recorded		8.8	22.6
Liability recorded, current			12.7
Liability recorded, noncurrent			9.9
Insurance proceeds, current assets			9.0
Reduction in liability		$ 13.9
Period for payment of remaining liability		4 years
Asbestos Litigation
Litigation contingencies
Number of lawsuits the entity is defending in different jurisdictions		59

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- Definition

Amount of judgment or settlement awarded to (against) the entity in respect of litigation.

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Amount of loss contingency liability.

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Amount of loss contingency liability expected to be resolved within one year or the normal operating cycle, if longer.

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Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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Number of defendants named in a legal action.

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The estimated maximum amount of possible loss from the contingency.

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Amount of receivable related to a loss contingency accrual. For example, an insurance recovery receivable.

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Amount of receivable related to a loss contingency accrual that is expected to be collected within one year or the normal operating cycle, if longer. For example, an insurance recovery receivable.

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