EARNINGS (LOSS) PER SHARE

The following table summarizes the reconciliation of the numerators and denominators for the basic and diluted earnings (loss) per share computation for the periods indicated:



	Three months ended November 30,				Six months ended November 30,
	2018		2017		2018		2017
Net income (loss) attributable to Class A and Common Shares	$	71.4	$	57.0	$	10.3	$	(6.6	)
Weighted average Shares of Class A Stock and Common Stock outstanding for basic earnings (loss) per share (in millions)	35.2		35.0		35.2		35.1
Dilutive effect of Class A Stock and Common Stock potentially issuable pursuant to stock-based compensation plans (in millions) *	0.7		0.6		0.6		—
Adjusted weighted average Shares of Class A Stock and Common Stock outstanding for diluted earnings (loss) per share (in millions)	35.9		35.6		35.8		35.1
Earnings (loss) per share of Class A Stock and Common Stock:
Basic	$	2.03	$	1.63	$	0.29	$	(0.19	)
Diluted	$	1.99	$	1.60	$	0.29	$	(0.19	)

* In the six month period ended November 30, 2017, the Company experienced a Net loss and therefore did not report any dilutive share impact.

The following table sets forth options outstanding pursuant to stock-based compensation plans as of the dates indicated:



	November 30, 2018	November 30, 2017
Options outstanding pursuant to stock-based compensation plans (in millions)	2.9	3.2

There were less than 0.1 million of potentially anti-dilutive shares pursuant to stock-based compensation plans as of November 30, 2018.

A portion of the Company’s Restricted Stock Units ("RSUs") which are granted to employees participate in earnings through cumulative dividends which are payable and non-forfeitable to the employees upon vesting of the RSUs. Accordingly, the Company measures earnings per share based upon the lower of the Two-class method or the Treasury Stock method.

Net income attributable to Class A and Common Shares excludes earnings of $0.2 and $0.1 for the three months ended November 30, 2018 and 2017, respectively, and earnings of less than $0.1 for the six months ended November 30, 2018, attributable to participating RSUs. In the six month period ended November 30, 2017, the Company experienced a Net loss and did not allocate any losses to the participating RSUs.

As of November 30, 2018, $61.4 remained available for future purchases of common shares under the repurchase authorization of the Board of Directors (the "Board") in effect on that date. See Note 11, Treasury Stock, for a more complete description of the Company’s share buy-back program.