Segment Reporting (Tables)

9 Months Ended

Mar. 31, 2017

Segment Reporting [Abstract]

Summary of Financial Information by Segments

	As of and for the three months ended March 31, 2017
	Fiber Solutions		Transport		Enterprise Networks		zColo		Allstream		Other		Corp/ Eliminations		Total
	(in millions)
Revenue from external customers	$	179.6	$	110.5	$	121.7	$	53.6	$	79.3	$	5.5	$	—	$	550.2
Segment Adjusted EBITDA		137.6		45.7		46.6		28.7		22.0		1.4		—		282.0
Capital expenditures		119.9		40.2		22.6		23.7		1.9		—		—		208.3

	As of and for the nine months ended March 31, 2017
	Fiber Solutions		Transport		Enterprise Networks		zColo		Allstream		Other		Corp/ Eliminations		Total
	(in millions)
Revenue from external customers	$	531.2	$	323.0	$	350.8	$	157.3	$	185.4	$	14.1	$	—	$	1,561.8
Segment Adjusted EBITDA		416.8		134.9		126.9		82.6		41.3		3.5		—		806.0
Total assets		4,319.7		1,252.3		1,180.0		931.0		644.8		31.5		189.1		8,548.4
Capital expenditures		381.6		111.1		63.6		69.9		4.0		—		—		630.2

	As of and for the three months ended March 31, 2016
	Fiber Solutions		Transport		Enterprise Networks		zColo		Allstream		Other		Corp/ Eliminations		Total
	(in millions)
Revenue from external customers	$	169.4	$	102.6	$	105.3	$	47.9	$	48.0	$	4.8	$	—	$	478.0
Segment Adjusted EBITDA		131.3		42.5		37.4		24.2		6.1		1.3		—		242.8
Capital expenditures		111.0		30.3		24.3		17.2		2.3		—		—		185.1

	As of and for the nine months ended March 31, 2016
	Fiber Solutions		Transport		Enterprise Networks		zColo		Allstream		Other		Corp/ Eliminations		Total
	(in millions)
Revenue from external customers	$	476.6	$	284.4	$	244.4	$	145.0	$	48.0	$	16.0	$	—	$	1,214.4
Segment Adjusted EBITDA		364.2		122.6		105.8		74.5		6.1		3.9		—		677.1
Capital expenditures		315.1		90.1		63.7		45.5		2.3		—		—		516.7

	As of June 30, 2016
	Fiber Solutions		Transport		Enterprise Networks		zColo		Allstream		Other		Corp/ Eliminations		Total
	(in millions)
Total assets	$	3,780.9	$	964.8	$	849.2	$	884.3	$	72.6	$	33.5	$	142.2		$	6,727.5

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

	For the three months ended March 31,
	2017		2016
	(in millions)
Total Segment Adjusted EBITDA	$	282.0	$	242.8
Interest expense		(63.0)		(57.7)
Depreciation and amortization expense		(155.7)		(137.2)
Transaction costs		(8.4)		(14.2)
Stock-based compensation		(26.5)		(33.5)
Loss on extinguishment of debt		(4.5)		—
Foreign currency gain/(loss) on intercompany loans		3.9		(11.1)
Non-cash loss on investments		(0.2)		(0.6)
Income/(loss) from operations before income taxes	$	27.6	$	(11.5)

	For the nine months ended March 31,
	2017		2016
	(in millions)
Total Segment Adjusted EBITDA	$	806.0	$	677.1
Interest expense		(170.0)		(162.7)
Depreciation and amortization expense		(425.6)		(368.0)
Transaction costs		(17.6)		(17.5)
Stock-based compensation		(93.0)		(122.5)
Loss on extinguishment of debt		(4.5)		—
Foreign currency gain/(loss) on intercompany loans		(24.7)		(28.9)
Non-cash loss on investments		(0.7)		(1.2)
Income/(loss) from operations before income taxes	$	69.9	$	(23.7)