Business and Basis of Presentation (Details) - USD ($) $ in Millions	3 Months Ended
Sep. 30, 2017	Sep. 30, 2016
Business and Basis of Presentation
Weighted-average shares adjustment for the dilutive effect of the Part A and Part B units and related issuance of common shares upon vesting	$ 1.5	$ 1.4

Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise stock options, restrictive stock units (RSUs), convertible preferred stock of an employee stock ownership plan (ESOP), and other dilutive convertible securities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Name:	us-gaap_DilutiveSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration