Acquisitions Pro Forma Narrative (Details) - Houston Interests, LLC [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Business Acquisition [Line Items]
Pro forma acquisition costs	$ 0.4		$ 3.4
Pro forma acquisition costs, amortized over time	0.4	$ 0.3	1.1	$ 0.8
Pro forma interest expense		0.4	0.7	1.0
Pro forma depreciation and amortization expense	$ 0.6	0.5	0.8	1.4
Pro forma income tax expense		$ 0.6	$ 4.3	$ 1.8