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Earnings (Loss) Per Share (Tables)
 9 Months Ended
Feb. 28, 2017
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
 
Nine months ended
 
February 28,
 
February 29,
 
February 28,
 
February 29,
 
2017
 
2016
 
2017
 
2016
Earnings (loss) from continuing operations attributable to Class A and Common Shares
$
(15.5
)
 
$
(7.2
)
 
$
12.9

 
$
9.1

Earnings (loss) from discontinued operations attributable to Class A and Common Shares, net of tax
0.1

 
(1.8
)
 
0.0

 
(2.6
)
Net income (loss) attributable to Class A and Common Shares
$
(15.4
)
 
$
(9.0
)
 
$
12.9

 
$
6.5

Weighted average Shares of Class A Stock and Common Stock outstanding for basic earnings (loss) per share (in millions)
34.8

 
34.3

 
34.6

 
34.0

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

 
—

 
0.7

 
0.9

Adjusted weighted average Shares of Class A Stock and Common Stock outstanding for diluted earnings (loss) per share (in millions)
34.8

 
34.3

 
35.3

 
34.9

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

 
 

 
 

 
 

Basic earnings (loss) per share:
 

 
 

 
 

 
 

Earnings (loss) from continuing operations
$
(0.45
)
 
$
(0.21
)
 
$
0.37

 
$
0.27

Earnings (loss) from discontinued operations, net of tax
$
0.01

 
$
(0.05
)
 
$
0.00

 
$
(0.08
)
Net income (loss)
$
(0.44
)
 
$
(0.26
)
 
$
0.37

 
$
0.19

Diluted earnings (loss) per share:
 

 
 

 
 

 
 

Earnings (loss) from continuing operations
$
(0.45
)
 
$
(0.21
)
 
$
0.36

 
$
0.26

Earnings (loss) from discontinued operations, net of tax
$
0.01

 
$
(0.05
)
 
$
0.00

 
$
(0.07
)
Net income (loss)
$
(0.44
)
 
$
(0.26
)
 
$
0.36

 
$
0.19
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, 2017
 
February 29, 2016
Options outstanding pursuant to stock-based compensation plans (in millions)
2.9
 
3.4