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Acquisitions - Tonka Water (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 01, 2017
Dec. 31, 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 $ 148.3 $ 131.2 $ 130.6
Tonka Water [Member]          
Business Acquisition [Line Items]          
Percentage of Voting Interests Acquired 100.00%        
Name of Acquired Entity Tonka Water        
Total Consideration $ 19.2        
Payments to Acquire Business 19.0        
Working Capital Adjustments   $ 0.2      
Assets Acquired [Abstract]          
Accounts Receivable 5.1        
Other Current Assets 5.1        
Trade Names [2] 0.9        
Goodwill [2],[3] 16.9        
Other Non-Current Assets 0.2        
Total Assets Acquired 28.2        
Liabilities Assumed [Abstract]          
Current Liabilities 9.0        
Total Liabilities Assumed 9.0        
Net Identifiable Assets Acquired 19.2        
Tax Deductible Goodwill $ 4.1        
[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] Recognized goodwill is attributable to the assembled workforce and anticipated synergies. For tax purposes, the purchase price allocation resulted in $4.1 million of deductible goodwill.