CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Revenue	$ 550.2	$ 478.0	$ 1,561.8	$ 1,214.4
Operating costs and expenses
Operating costs (excluding depreciation and amortization and including stock-based compensation—Note 8)	195.0	170.8	548.7	396.0
Selling, general and administrative expenses (including stock-based compensation—Note 8)	108.8	112.5	319.1	282.1
Depreciation and amortization	155.7	137.2	425.6	368.0
Total operating costs and expenses	459.5	420.5	1,293.4	1,046.1
Operating income	90.7	57.5	268.4	168.3
Other expenses
Interest expense	(63.0)	(57.7)	(170.0)	(162.7)
Loss on extinguishment of debt	(4.5)		(4.5)
Foreign currency gain/(loss) on intercompany loans	3.9	(11.1)	(24.7)	(28.9)
Other expense, net	0.5	(0.2)	0.7	(0.4)
Total other expenses, net	(63.1)	(69.0)	(198.5)	(192.0)
Income/(loss) from operations before income taxes	27.6	(11.5)	69.9	(23.7)
Provision for income taxes	0.6	7.8	7.4	21.6
Net income/(loss)	$ 27.0	$ (19.3)	$ 62.5	$ (45.3)
Weighted-average shares used to compute net income/(loss) per share:
Basic	244.1	243.3	243.3	243.7
Diluted	246.1	243.3	244.7	243.7
Net income/(loss) per share:
Basic	$ 0.11	$ (0.08)	$ 0.26	$ (0.19)
Diluted	$ 0.11	$ (0.08)	$ 0.26	$ (0.19)