Segment Reporting (Tables)

9 Months Ended

Mar. 31, 2016

Segment Reporting [Abstract]

Summary of Financial Information by Segments

The Company’s computation of Segment Adjusted EBITDA may not be comparable to other similarly titled measures computed by other companies because all companies do not calculate segment Adjusted EBITDA in the same fashion.

	As of and for the three months ended March 31, 2016
	Dark Fiber Solutions		Network Connectivity		Colocation and Cloud Infrastructure				Zayo Canada	Other		Corp/ Eliminations		Total
	(in millions)
Revenue from external customers	$	144.3	$	172.5	$	60.3	$	96.1		$	4.8	$	—	$	478.0
Segment Adjusted EBITDA		103.9		89.2		30.2		18.2			1.3		—		242.8
Total assets		3,139.0		1,890.1		1,040.7		452.7			33.9		276.8		6,833.2
Capital expenditures		110.3		44.2		19.5		11.1			—		—		185.1

	As of and for the nine months ended March 31, 2016
	Dark Fiber Solutions		Network Connectivity		Colocation and Cloud Infrastructure			Zayo Canada	Other		Corp/ Eliminations		Total
	(in millions)
Revenue from external customers	$	417.0	$	508.2	$	177.1	$	96.1	$	16.0	$	—	$	1,214.4
Segment Adjusted EBITDA		299.6		267.8		87.6		18.2		3.9		—		677.1
Capital expenditures		313.0		139.0		53.6		11.1		—		—		516.7

	As of and for the three months ended March 31, 2015
	Dark Fiber Solutions		Network Connectivity		Colocation and Cloud Infrastructure			Zayo Canada	Other		Corp/ Eliminations		Total
	(in millions)
Revenue from external customers	$	133.5	$	163.1	$	38.5	$	—	$	5.6	$	—	$	340.7
Segment Adjusted EBITDA		92.5		85.7		19.5		—		1.3		—		199.0
Total assets		2,754.2		1,794.0		1,013.6		—		38.6		391.5		5,991.9
Capital expenditures		73.1		46.9		10.1		—		—		—		130.1

	As of and for the nine months ended March 31, 2015
	Dark Fiber Solutions		Network Connectivity		Colocation and Cloud Infrastructure		Zayo Canada		Other		Corp/ Eliminations		Total
	(in millions)
Revenue from external customers	$	390.6	$	485.0	$	92.4	$	—	$	17.2	$	—	$	985.2
Segment Adjusted EBITDA		267.3		254.4		46.2		—		3.8		—		571.7
Capital expenditures		200.9		145.7		28.3		—		—		—		374.9

	As of June 30, 2015
	Dark Fiber Solutions		Network Connectivity		Colocation and Cloud Infrastructure				Zayo Canada	Other		Corp/ Eliminations		Total
	(in millions)
Total assets	$	2,848.9	$	1,807.7	$	1,013.7	$	—		$	35.0	$	389.3	$	6,094.6

Reconciliation from net earnings/(loss) to Adjusted EBITDA by segment and on a consolidated basis

Reconciliation from Total Segment Adjusted EBITDA to net loss from operations:

	Three months ended  March 31,
	2016		2015
		(in millions)
Total Segment Adjusted EBITDA	$	242.8	$	199.0
Interest expense		(57.7)		(60.7)
Depreciation and amortization expense		(137.2)		(100.1)
Transaction costs		(14.2)		(1.5)
Stock-based compensation		(33.5)		(40.7)
Loss on extinguishment of debt		—		(54.9)
Unrealized foreign currency loss on intercompany loans		(11.1)		(13.2)
Non-cash loss on investments		(0.6)		—
Loss from operations before income taxes	$	(11.5)	$	(72.1)

	Nine months ended March 31,
	2016		2015
		(in millions)
Total Segment Adjusted EBITDA	$	677.1	$	571.7
Interest expense		(162.7)		(161.0)
Depreciation and amortization expense		(368.0)		(293.0)
Transaction costs		(17.5)		(6.2)
Stock-based compensation		(122.5)		(157.8)
Loss on extinguishment of debt		—		(85.8)
Unrealized foreign currency loss on intercompany loans		(28.9)		(41.2)
Non-cash loss on investments		(1.2)		(0.5)
Loss from operations before income taxes	$	(23.7)	$	(173.8)