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Earnings (Loss) Per Share (Tables)
 9 Months Ended
Feb. 28, 2019
Earnings Per Share [Abstract]  
Schedule of basic and diluted earnings 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 February 28,
Nine months ended February 28,
 
2019
 
2018
2019
 
2018
Net income (loss) attributable to Class A and Common Shares
$
(12.6
)
 
$
(49.2
)
$
(2.3
)
 
$
(55.8
)
Weighted average Shares of Class A Stock and Common Stock outstanding for basic earnings (loss) per share (in millions)
35.3

 
34.9

35.2

 
35.1

Dilutive effect of Class A Stock and Common Stock potentially issuable pursuant to stock-based compensation plans (in millions) *
—

 
—

—

 
—

Adjusted weighted average Shares of Class A Stock and Common Stock outstanding for diluted earnings (loss) per share (in millions)
35.3

 
34.9

35.2

 
35.1

Earnings (loss) per share of Class A Stock and Common Stock:
 

 
 

 

 
 

Basic
$
(0.36
)
 
$
(1.41
)
$
(0.07
)
 
$
(1.59
)
Diluted
$
(0.36
)
 
$
(1.41
)
$
(0.07
)
 
$
(1.59
)
Schedule of stock option activity
The following table sets forth options outstanding pursuant to stock-based compensation plans as of the dates indicated: 
 
February 28, 2019
 
February 28, 2018
Options outstanding pursuant to stock-based compensation plans (in millions)
2.9

 
3.1