Basis of Presentation and Summary of Significant Accounting Policies Basis of Presentation and Summary of Significant Accounting Policies - Business (Details) $ / shares in Units, shares in Millions, $ in Millions					3 Months Ended			9 Months Ended
		Jun. 02, 2015 $ / shares shares	Mar. 09, 2015 $ / shares shares	Jul. 17, 2014	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Sep. 30, 2014 USD ($) shares	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Jul. 31, 2014 $ / shares
Stockholders' Equity Note, Stock Split, Conversion Ratio				70
Stock Issued During Period, Shares, New Issues							48.9
Share Price | $ / shares										$ 20.50
Proceeds from Issuance Initial Public Offering | $							$ 952.2
(Gain) / Loss on Contract Termination | $	[1]				$ 0.0	$ 0.0		$ 0.0	$ 29.8
Sale of Stock, Number of Shares, Underwriters Option to Purchase		2.1	3.6
Blackstone [Member]
Share Price | $ / shares		$ 29.00	$ 29.50
Sale of Stock, Number of Shares Sold by Entity		16.1	27.3
Noncontrolling Interest, Ownership Percentage by Parent		20.80%	32.70%

[1] The Company paid a sponsor advisory agreement termination fee of $29.8 million in connection with its IPO.