CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Revenue	$ 506.7	$ 369.6	$ 1,011.6	$ 736.4
Operating costs and expenses
Operating costs (excluding depreciation and amortization and including stock-based compensation—Note 8)	179.9	112.2	353.7	225.2
Selling, general and administrative expenses (including stock-based compensation—Note 8)	104.7	85.0	210.3	169.6
Depreciation and amortization	131.4	113.7	269.9	230.8
Total operating costs and expenses	416.0	310.9	833.9	625.6
Operating income	90.7	58.7	177.7	110.8
Other expenses
Interest expense	(53.7)	(51.2)	(107.0)	(105.0)
Foreign currency loss on intercompany loans	(17.4)	(7.1)	(28.6)	(17.8)
Other expense, net	0.4	(0.1)	0.2	(0.2)
Total other expenses, net	(70.7)	(58.4)	(135.4)	(123.0)
Income/(loss) from operations before income taxes	20.0	0.3	42.3	(12.2)
Provision for income taxes	0.2	11.1	6.8	13.8
Net income/(loss)	$ 19.8	$ (10.8)	$ 35.5	$ (26.0)
Weighted-average shares used to compute net income/(loss) per share:
Basic	243.1	244.8	242.9	243.9
Diluted	245.6	244.8	244.9	243.9
Net income/(loss) per share:
Basic	$ 0.08	$ (0.04)	$ 0.15	$ (0.11)
Diluted	$ 0.08	$ (0.04)	$ 0.14	$ (0.11)