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Acquisitions Pro Forma Narrative (Details) - Houston Interests, LLC [Member] - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]        
Pro forma acquisition costs       $ 3.0
Pro forma acquisition costs, amortized over time $ 0.4 $ 0.3 $ 0.8 0.5
Pro forma interest expense 0.3   0.7  
Pro forma depreciation and amortization expense 0.2 0.5 0.3 0.9
Pro forma income tax expense $ 1.9 $ 2.5 $ 3.3 $ 2.1