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Acquisitions - Schedule of Purchase Price and Purchase Price Allocation (Details) - USD ($)
$ in Millions
Aug. 16, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Purchase price allocation        
Goodwill   $ 0.0 $ 9.0 $ 1.6
ESCO        
Purchase price        
Cash $ 47.7      
Seller's notes 7.0      
Equity issued 5.0      
Total purchase price 59.7      
Purchase price allocation        
Accounts receivable 6.6      
Property, plant and equipment 45.9      
Intangible assets 2.2      
Other assets 0.3      
Total assets acquired 55.0      
Accounts payable (0.5)      
Accrued expenses (2.2)      
Total liabilities assumed (2.7)      
Goodwill 7.4      
Allocated purchase price $ 59.7