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Acquisitions - Bluewater - Purchase Price Allocation (Details) - Bluewater
$ in Millions
1 Months Ended
Jun. 30, 2017
USD ($)
Business Acquisition [Line Items]  
Current assets $ 2.0
Net property, plant, and equipment 217.6
Goodwill 7.3
Current liabilities (0.9)
Total purchase price $ 226.0