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Accounting Policies Basis of Presentation (Details)
$ in Millions
May 21, 2018
USD ($)
Feb. 12, 2018
USD ($)
asphalt_terminal
Aug. 31, 2016
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net proceeds from equity method investment $ 110.8    
Four Asphalt Terminals      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Cash consideration   $ 75.0  
Number of asphalt terminals | asphalt_terminal   4  
Retail Entities | Discontinued Operations, Disposed of by Sale      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Cash consideration     $ 535.0
Paramount-Nevada Asphalt Company, LLC      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Equity method investment, ownership percentage 50.00% 50.00%