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Earnings (Loss) Per Share (Tables)
 12 Months Ended
May 31, 2018
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 fiscal years ended May 31:
 
2018
 
2017
 
2016
Earnings (loss) from continuing operations attributable to Class A and Common Shares
$
(5.0
)
 
$
52.4

 
$
43.9

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

 
(0.2
)
 
(3.5
)
Net income (loss) attributable to Class A and Common Shares
(5.0
)
 
52.2

 
40.4

Weighted average Shares of Class A Stock and Common Stock
outstanding for basic earnings (loss) per share (in millions)
35.0

 
34.7

 
34.1

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

 
0.7

 
0.8

Adjusted weighted average Shares of Class A Stock and Common Stock outstanding for diluted earnings (loss) per share (in millions)
35.0

 
35.4

 
34.9

 
 

 
 

 
 

Earnings (loss) per share of Class A Stock and Common Stock
 
 
 
 
 
Basic earnings (loss) per share:
 
 
 
 
 
Earnings (loss) from continuing operations
$
(0.14
)
 
$
1.51

 
$
1.29

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

 
$
(0.00
)
 
$
(0.11
)
Net income (loss)
$
(0.14
)
 
$
1.51

 
$
1.18

Diluted earnings (loss) per share:


 
 

 
 

Earnings (loss) from continuing operations
$
(0.14
)
 
$
1.48

 
$
1.26

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

 
$
(0.01
)
 
$
(0.10
)
Net income (loss)
$
(0.14
)
 
$
1.47

 
$
1.16
Schedule of Options Outstanding
The following table sets forth Options outstanding pursuant to stock-based compensation plans for the fiscal years ended May 31:
 
2018
 
2017
Options outstanding pursuant to stock-based compensation plans (in millions)
2.8
 
2.7