Segment Reporting (Tables)

3 Months Ended

Sep. 30, 2017

Segment Reporting [Abstract]

Summary of Financial Information by Segments

	As of and for the three months ended September 30, 2017
	Fiber Solutions		Transport		Enterprise Networks		zColo		Allstream		Other		Corp/ Eliminations		Total
	(in millions)
Revenue from external customers	$	195.5	$	119.1	$	137.7	$	58.4	$	127.7	$	5.1	$	—	$	643.5
Segment Adjusted EBITDA		154.2		51.6		49.5		29.4		30.8		1.1		—		316.6
Total assets		4,517.9		1,256.5		1,394.6		1,005.5		424.3		32.2		231.4		8,862.4
Capital expenditures		107.3		33.7		21.0		27.9		3.5		—		—		193.4

	As of and for the three months ended September 30, 2016
	Fiber Solutions		Transport		Enterprise Networks		zColo		Allstream		Other		Corp/ Eliminations		Total
	(in millions)
Revenue from external customers	$	174.1	$	106.1	$	114.4	$	51.2	$	54.5	$	4.6	$	—	$	504.9
Segment Adjusted EBITDA		138.3		44.6		40.6		26.3		9.7		1.1		—		260.6
Capital expenditures		130.8		33.5		20.9		22.9		0.2		—		—		208.3

	As of June 30, 2017
	Fiber Solutions		Transport		Enterprise Networks		zColo		Allstream		Other		Corp/ Eliminations		Total
	(in millions)
Total assets	$	4,504.6	$	1,230.0	$	1,385.7	$	994.4	$	406.2	$	33.2	$	185.3	$	8,739.4

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

	For the three months ended September 30,
	2017		2016
	(in millions)
Total Segment Adjusted EBITDA	$	316.6	$	260.6
Interest expense		(73.6)		(53.3)
Depreciation and amortization expense		(184.1)		(138.5)
Transaction costs		(8.3)		(3.0)
Stock-based compensation		(27.8)		(32.0)
Loss on extinguishment of debt		(4.9)		—
Foreign currency gain/(loss) on intercompany loans		10.8		(11.2)
Non-cash loss on investments		(0.1)		(0.3)
Income from operations before income taxes	$	28.6	$	22.3