CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS’ EQUITY - USD ($) $ in Millions	Common Stock	Additional paid-in Capital	Accumulated Other Comprehensive Income/(loss)	Accumulated Deficit	Total
Balance at Jun. 30, 2015	$ 0.2	$ 1,705.8	$ (7.9)	$ (486.9)	$ 1,211.2
Balance, shares at Jun. 30, 2015	243,008,679
Stock-based compensation		152.9			152.9
Stock-based compensation, shares	3,114,939
Foreign currency translation adjustment, net of tax			12.4		12.4
Repurchase and retirement of common shares		(81.1)			(81.1)
Repurchase and retirement of common shares (in shares)	(3,474,120)
Net income/(loss)				(76.2)	(76.2)
Balance at Jun. 30, 2016	$ 0.2	1,777.6	4.5	(563.1)	1,219.2
Balance, shares at Jun. 30, 2016	242,649,498
Stock-based compensation		104.7			104.7
Stock-based compensation, shares	3,822,053
Cumulative effect adjustment resulting from adoption of ASU 2016-09 (Note 2)		1.7		(1.7)
Foreign currency translation adjustment, net of tax			2.1		2.1
Defined benefit pension plan adjustments, net of tax			(1.2)		(1.2)
Net income/(loss)				85.7	85.7
Balance at Jun. 30, 2017	$ 0.2	1,884.0	5.4	(479.1)	$ 1,410.5
Balance, shares at Jun. 30, 2017	246,471,551				246,471,551
Stock-based compensation		91.1			$ 91.1
Stock-based compensation, shares	2,908,769
Cumulative effect adjustment resulting from adoption of ASU 2016-09 (Note 2)					1.7
Foreign currency translation adjustment, net of tax			(7.4)		(7.4)
Repurchase and retirement of common shares		(93.5)			(93.5)
Repurchase and retirement of common shares (in shares)	(2,749,079)
Defined benefit pension plan adjustments, net of tax			(13.5)		(13.5)
Net income/(loss)				101.9	101.9
Balance at Jun. 30, 2018	$ 0.2	$ 1,881.6	$ (15.5)	$ (377.2)	$ 1,489.1
Balance, shares at Jun. 30, 2018	246,631,241				246,631,241