CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Millions	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income/(Loss)	Accumulated Deficit	Total
Balance at Jun. 30, 2018	$ 0.2	$ 1,881.6	$ (15.5)	$ (366.0)	$ 1,500.3
Balance, shares at Jun. 30, 2018	246,438,483
Stock-based compensation		26.3			26.3
Stock-based compensation, shares	700,439
Foreign currency translation adjustments			8.2		8.2
Repurchase and retirement of common shares		(0.2)			(0.2)
Repurchase and retirement of common shares (in shares)	(6,229)
Defined benefit pension plan adjustments			(1.9)		(1.9)
Net income				22.1	22.1
Balance at Sep. 30, 2018	$ 0.2	1,907.7	(9.2)	(343.9)	1,554.8
Balance, shares at Sep. 30, 2018	247,132,693
Balance at Jun. 30, 2019	$ 0.2	1,581.2	(23.9)	(216.0)	$ 1,341.5
Balance, shares at Jun. 30, 2019	236,257,893				236,257,893
Stock-based compensation		26.3			$ 26.3
Stock-based compensation, shares	571,411
Foreign currency translation adjustments			(14.8)		(14.8)
Defined benefit pension plan adjustments			0.4		0.4
Net income				17.9	17.9
Balance at Sep. 30, 2019	$ 0.2	$ 1,607.5	$ (38.3)	$ (198.1)	$ 1,371.3
Balance, shares at Sep. 30, 2019	236,829,304				236,829,304