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Acquisitions - WEST (Details) - USD ($)
$ in Millions
 1 Months Ended 6 Months Ended 12 Months Ended
Oct. 11, 2016
Oct. 31, 2016
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]            
Working Capital Adjustments [1]       $ 0.2    
Assets Acquired [Abstract]            
Goodwill       $ 148.3 $ 131.2 $ 130.6
Water & Energy Systems Technology [Member]            
Business Acquisition [Line Items]            
Percentage of Voting Interests Acquired 100.00%          
Name of Acquired Entity Water & Energy Systems Technology of Nevada, Inc.          
Total Consideration   $ 6.7        
Payments to Acquire Business   5.9        
Working Capital Adjustments     $ 0.2      
Payments Due in April 2018   $ 0.6        
Assets Acquired [Abstract]            
Cash and Cash Equivalents $ 0.1          
Other Current Assets 1.0          
Intangible Assets [2] 2.8          
Goodwill [2],[3] 4.2          
Other Non-Current Assets 0.1          
Total Assets Acquired 8.2          
Liabilities Assumed [Abstract]            
Current Liabilities 0.3          
Non-Current Liabilities 1.2          
Total Liabilities Assumed 1.5          
Net Identifiable Assets Acquired 6.7          
Tax Deductible Goodwill $ 0.0          
[1] Finalization of purchase price accounting for U.S. Water Services’ acquisition of WEST was completed in 2017 resulting in an adjustment to the goodwill recorded at the time of the initial acquisition.
[2] Presented within Goodwill and Intangible Assets – Net on the Consolidated Balance Sheet. (See Note 7. Goodwill and Intangible Assets.)
[3] For tax purposes, the purchase price allocation resulted in no allocation to goodwill.