Quarterly report pursuant to Section 13 or 15(d)

Acquisition Recognized Assets and Liabilities (Details)

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Acquisition Recognized Assets and Liabilities (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Business Acquisition [Line Items]    
Goodwill $ 4.5 $ 4.5
Alumet [Member]    
Business Acquisition [Line Items]    
Consideration transferred 41.6  
Accounts receivable 16.9  
Inventories 30.6  
Prepaid expenses and other current assets 0.3  
Property, plant and equipment 5.7  
Intangible assets 1.7  
Other noncurrent assets 0.1  
Accounts payable (8.1)  
Accrued liabilities (4.0)  
Capital lease liability (1.7)  
Total fair value of assets acquired and liabilities assumed 41.5  
Goodwill $ 0.1