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ACQUISITIONS- BLUEWATER ACQUISITION - PURCHASE PRICE ALLOCATION (Details) - Bluewater - USD ($)
$ in Millions
1 Months Ended 9 Months Ended
Jun. 30, 2017
Sep. 30, 2017
Business Acquisition [Line Items]    
Current assets $ 2.0  
Net property, plant, and equipment 217.6  
Goodwill 7.3 $ 7.3
Current liabilities (0.9)  
Total purchase price $ 226.0