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Acquisitions - WEST (Details) - USD ($)
$ in Millions
Oct. 11, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Assets Acquired [Abstract]        
Goodwill   $ 131.2 $ 130.6 $ 2.9
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 $ 6.5      
Payments to Acquire Business 5.9      
Payments Due in April 2018 0.6      
Assets Acquired [Abstract]        
Cash and Cash Equivalents 0.1      
Other Current Assets 1.1      
Customer Relationships [1] 2.8      
Goodwill [2] 3.9      
Other Non-Current Assets 0.1      
Total Assets Acquired 8.0      
Liabilities Assumed [Abstract]        
Current Liabilities 0.2      
Non-Current Liabilities 1.2      
Total Liabilities Assumed 1.4      
Net Identifiable Assets Acquired 6.6      
Tax Deductible Goodwill $ 0.0      
[1] Presented within Goodwill and Intangible Assets – Net on the Consolidated Balance Sheet. (See Note 7. Goodwill and Intangible Assets.)
[2] For tax purposes, the purchase price allocation resulted in no allocation to goodwill.