CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Revenue	$ 649.4	$ 550.2	$ 1,946.4	$ 1,561.8
Operating costs and expenses
Operating costs (excluding depreciation and amortization and including stock-based compensation—Note 8)	234.9	195.0	702.6	548.7
Selling, general and administrative expenses (including stock-based compensation—Note 8)	118.0	108.8	367.9	319.1
Depreciation and amortization	191.2	155.7	571.2	425.6
Total operating costs and expenses	544.1	459.5	1,641.7	1,293.4
Operating income	105.3	90.7	304.7	268.4
Other expenses
Interest expense	(75.3)	(63.0)	(222.0)	(170.0)
Loss on extinguishment of debt		(4.5)	(4.9)	(4.5)
Foreign currency gain/(loss) on intercompany loans	13.9	3.9	27.8	(24.7)
Other income, net	0.4	0.5	1.7	0.7
Total other expenses, net	(61.0)	(63.1)	(197.4)	(198.5)
Income from operations before income taxes	44.3	27.6	107.3	69.9
Provision for income taxes	20.9	0.6	49.2	7.4
Net income	$ 23.4	$ 27.0	$ 58.1	$ 62.5