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Commitments and Contingencies - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2015
Ciner Wyoming      
Commitments And Contingencies [Line Items]      
Contingent consideration accrued     $ 7.2
Anadarko Holding Company      
Commitments And Contingencies [Line Items]      
Contingent consideration accrued     7.2
Net present value payable of contingent consideration under the agreement     50.0
Anadarko Holding Company | Ciner Wyoming      
Commitments And Contingencies [Line Items]      
Contingent consideration paid $ 3.8 $ 0.5  
Lawsuit Against Hillsboro Energy LLC      
Commitments And Contingencies [Line Items]      
Minimum quarterly deficiency payments     7.5
Minimum deficiency payments     30.0
Loss contingency     $ 16.2