Segment Reporting (Tables)

12 Months Ended

Jun. 30, 2017

Segment Reporting [Abstract]

Summary of Financial Information by Segments

	For the year ended June 30, 2017
	Fiber Solutions		Transport		Enterprise Networks		zColo			Allstream		Other		Corp/ Eliminations		Total
	(in millions)
Revenue from external customers	$	722.1	$	440.4	$	487.4	$	214.0	$	314.3	$	21.6	$	—	$	2,199.8
Segment Adjusted EBITDA		566.3		184.2		178.0		111.9		71.3		5.1		—		1,116.8
Total assets		4,504.6		1,230.0		1,385.7		994.4		406.2		33.2		185.3		8,739.4
Capital expenditures		499.1		147.3		89.1		91.5		8.5		—		—		835.5

	For the year ended June 30, 2016
	Fiber Solutions		Transport		Enterprise Networks		zColo			Allstream		Other		Corp/ Eliminations		Total
	(in millions)
Revenue from external customers	$	648.8	$	391.4	$	359.6	$	195.4	$	106.2	$	20.3	$	—	$	1,721.7
Segment Adjusted EBITDA		499.6		168.0		145.6		100.9		16.3		4.5		—		934.9
Total assets		3,780.9		964.8		849.2		884.3		72.6		33.5		142.2		6,727.5
Capital expenditures		421.4		123.1		88.0		66.3		5.3		—		—		704.1

	For the year ended June 30, 2015
	Fiber Solutions		Transport		Enterprise Networks		zColo			Allstream		Other		Corp/ Eliminations		Total
	(in millions)
Revenue from external customers	$	575.6	$	336.4	$	285.0	$	126.9	$	—	$	23.2	$	—	$	1,347.1
Segment Adjusted EBITDA		400.7		139.3		172.8		64.7		—		5.1		—		782.6
Capital expenditures		303.5		110.6		62.8		53.5		—		—		—		530.4

Reconciliation from Total Segment Adjusted EBITDA to income/(loss) from operations before taxes

Reconciliation from Total Segment Adjusted EBITDA to income/(loss) from operations before income taxes

	For the year ended June 30,
	2017		2016		2015
Total Segment Adjusted EBITDA	$	1,116.8	$	934.9	$	782.6
Interest expense		(241.5)		(220.1)		(214.0)
Depreciation and amortization		(606.9)		(516.3)		(406.2)
Transaction costs		(20.5)		(21.5)		(6.2)
Stock-based compensation		(114.1)		(155.9)		(200.7)
Loss on extinguishment of debt		(18.2)		(33.8)		(94.3)
Foreign currency loss on intercompany loans		(10.3)		(53.8)		(24.4)
Non-cash loss on investments		(1.2)		(1.2)		(0.9)
Income/(loss) from operations before income taxes	$	104.1	$	(67.7)	$	(164.1)

Schedule of Geographical Information

	For the year ended June 30,
	2017		2016		2015
Revenue from external customers:
United States	$	1,610.0	$	1,334.1	$	1,193.5
Europe		176.5		174.1		153.6
Canada		412.0		213.3		—
Other		1.3		0.2		—
Total Revenue	$	2,199.8	$	1,721.7	$	1,347.1
Long-lived assets:
United States	$	5,504.7	$	4,236.1		3,848.0
Europe		521.3		527.8		454.0
Canada		335.8		326.4		—
Other		22.8		25.6		0.3
Total Long-lived assets	$	6,384.6	$	5,115.9	$	4,302.3