Basis of Presentation Basis of Presentation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Effect of new accounting standard compared to old standard	$ 0.4
Effect of adoption of new accounting standard compared to old standard, EPS	$ 0.01
New Accounting Pronouncement or Change in Accounting Principle, Description of Prior-period Information Retrospectively Adjusted		The amendments relating to the presentation of excess tax benefits and tax deficiencies in the statement of cash flows were applied retrospectively. The effect of the retrospective adjustment was to eliminate the presentation of an operating cash outflow and a financing cash inflow for excess tax benefits on exercised stock options and vesting of deferred shares. These eliminations reduced both net cash used by operating activities and net cash provided by financing activities by less than $0.1 million for the three months ended September 30, 2015. Net cash flows did not change as a result of the retrospective adjustment.