CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (UNAUDITED) (USD $) In Millions, except Share data	Total	Common Stock [Member]	Additional paid-in Capital [Member]	Accumulated Other Comprehensive Income/(Loss) [Member]	Accumulated Deficit [Member]	Note receivable from shareholder
Balance at Jun. 30, 2014	$ 416.4	$ 0.2	$ 755.4	$ 14.4	$ (331.6)	$ (22.0)
Balance (in shares) at Jun. 30, 2014	223,000,000	223,000,000
Proceeds from issuance of common stock, initial public offering	387.2		387.2
Common stock shares issued as initial public offering		20,008,679
Reclassification of common unit liability to additional paid-in capital	490.2		490.2
Stock-based compensation	52.4		52.4
Non-cash settlement of note receivable from Communications Infrastructure Investments, LLC (Note 8)			(22.0)			22.0
Foreign currency translation adjustments	(35.5)			(35.5)
Net loss	(160.4)				(160.4)
Balance at Mar. 31, 2015	$ 1,150.3	$ 0.2	$ 1,663.2	$ (21.1)	$ (492.0)
Balance (in shares) at Mar. 31, 2015	243,008,679	243,008,679