CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Revenue	$ 2,199.8	$ 1,721.7	$ 1,347.1
Operating costs and expenses
Operating costs (excluding depreciation and amortization and including stock-based compensation—Note 11)	782.9	578.7	413.5
Selling, general and administrative expenses (including stock-based compensation—Note 11)	436.2	386.4	358.4
Depreciation and amortization	606.9	516.3	406.2
Total operating costs and expenses	1,826.0	1,481.4	1,178.1
Operating income	373.8	240.3	169.0
Other expenses
Interest expense	(241.5)	(220.1)	(214.0)
Loss on extinguishment of debt	(18.2)	(33.8)	(94.3)
Foreign currency income/(loss) on intercompany loans	(10.3)	(53.8)	(24.4)
Other income/(expense), net	0.3	(0.3)	(0.4)
Total other expenses, net	(269.7)	(308.0)	(333.1)
Income/(loss) from operations before income taxes	104.1	(67.7)	(164.1)
Provision/(benefit) for income taxes	18.4	8.5	(8.8)
Net income/(loss)	$ 85.7	$ (76.2)	$ (155.3)
Weighted-average shares used to compute net income/(loss) per share:
Basic	243.9	243.3	235.4
Diluted	246.8	243.3	235.4
Net income/(loss) per share:
Basic and diluted	$ 0.35	$ (0.31)	$ (0.66)