Goodwill (Tables)

3 Months Ended

Sep. 30, 2017

Goodwill [Abstract]

Schedule of Goodwill

Product Group	As of June 30, 2017		Adjustments to Fiscal 2017 Acquisitions		Foreign Currency Translation and Other		As of September 30, 2017
	(in millions)
Fiber Solutions	$	633.9	$	0.2	$	2.5	$	636.6
Waves		247.4		—		1.3		248.7
Sonet		52.0		—		—		52.0
Ethernet		359.5		—		0.2		359.7
EPIC		89.5		—		0.2		89.7
zColo		256.3		(3.1)		0.9		254.1
Cloud		69.5		—		—		69.5
Allstream		116.5		—		—		116.5
Other		15.6		1.7		—		17.3
Total	$	1,840.2	$	(1.2)	$	5.1	$	1,844.1