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Goodwill and Intangible Assets - Goodwill (Details) - U.S. Water Services [Member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Goodwill [Roll Forward]    
Beginning Balance $ 148.3 $ 131.2
Acquired Goodwill [1]   16.9
Other Adjustments [2] 0.2 0.2
Ending Balance $ 148.5 $ 148.3
[1] See Note 6. Acquisitions.
[2] Finalization of purchase price accounting for U.S. Water Services’ acquisition of WEST was completed in 2017 and acquisition of Tonka Water was completed in 2018 resulting in adjustments in those periods to the goodwill recorded at the time of acquisition.