Preferred and Common Stockholder's Equity (Tables)

6 Months Ended

Dec. 31, 2018

Equity [Abstract]

Summary of Common Shares Issued and Outstanding

Common shares issued and outstanding

	Six months ended			Year ended
	December 31,			June 30,
	2018			2018
Common stock issued and outstanding at July 1		70.6			68.4
Common stock issued upon exercise of options and employee    stock plans		4.2			2.2
Repurchase and retirement of common stock		(1.6	)		—
Common stock issued and outstanding at end of period		73.2			70.6

Reconciliation of Denominators of Basic and Diluted Earnings Per Share Computations

The following is a reconciliation of the denominators of the basic and diluted earnings per share (“EPS”) computations:

	Three months ended				Six months ended
	December 31,				December 31,
	2018		2017		2018		2017
Denominator:
Weighted-average shares outstanding used to compute    basic EPS		74.2		69.3		73.6		68.9
Effect of dilutive shares		2.3		2.6		3.3		2.3
Weighted-average shares outstanding and dilutive    securities used to compute diluted EPS		76.5		71.9		76.9		71.2

Schedule of Anti-Dilutive Options and Restricted Stock Units Excluded from EPS Computation

These potential dilutive common shares, which may be dilutive to future diluted earnings per share, are as follows:

	Three months ended				Six months ended
	December 31,				December 31,
	2018		2017		2018		2017
Anti-dilutive options and RSU's excluded from EPS    computation		1.1		0.2		0.6		0.5

Schedule of Stock Repurchases

The shares retired, aggregate common stock and additional paid-in capital reductions, and related charges to accumulated deficit for the repurchases for periods ended December 31, 2018 and 2017 were as follows:

	Three months ended				Six months ended
	December 31,				December 31,
	2018		2017		2018		2017
Shares purchased and retired		1.6		—		1.6		—
Common stock and additional paid-in-capital reductions	$	16.9	$	—	$	16.9	$	—
Charges to retained earnings	$	33.1	$	—	$	33.1	$	—