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Subsequent Event In Text Tagging (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011 Maine Water Company [Member] Customers	Feb. 03, 2012 Hebron Country Manor [Member]	Jul. 18, 2012 Biddeford and Saco [Member]
Subsequent Event [Line Items]
Number of customers	16,000		15,500
Business Combination, Consideration Transferred	$ 35.6	$ 130.0	$ 11.4

This element represents the acquisition-date fair value of the total consideration transferred which consists of the sum of the acquisition-date fair values of the assets transferred by the acquirer, the liabilities incurred by the acquirer to former owners of the acquiree, and the equity interests issued by the acquirer.

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