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Earnings (Loss) Per Share (Tables)
 12 Months Ended
May. 31, 2015
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:
 
2015
 
2014
 
2013
Earnings (loss) from continuing operations attributable to Class A and
  Common Shares
$
15.4

 
$
13.2

 
$
4.8

Earnings (loss) from discontinued operations attributable to Class A and
  Common Shares, net of tax
279.1

 
31.1

 
26.2

Net income (loss) attributable to Class A and Common Shares
294.5

 
44.3

 
31.0

Weighted average Shares of Class A Stock and Common Stock
  outstanding for basic earnings (loss) per share (in millions)
32.7

 
32.0

 
31.8

Dilutive effect of Class A Stock and Common Stock potentially issuable
  pursuant to stock-based compensation plans (in millions)
0.7

 
0.5

 
0.6

Adjusted weighted average Shares of Class A Stock and Common Stock
  outstanding for diluted earnings (loss) per share (in millions)
33.4

 
32.5

 
32.4

 
 

 
 

 
 

Earnings (loss) per share of Class A Stock and Common Stock
 
 
 
 
 
Basic earnings (loss) per share:
 
 
 
 
 
Earnings (loss) from continuing operations
$
0.47

 
$
0.42

 
$
0.15

Earnings (loss) from discontinued operations, net of tax
$
8.53

 
$
0.97

 
$
0.82

Net income (loss)
$
9.00

 
$
1.39

 
$
0.97

Diluted earnings (loss) per share:


 
 

 
 

Earnings (loss) from continuing operations
$
0.46

 
$
0.41

 
$
0.15

Earnings (loss) from discontinued operations, net of tax
$
8.34

 
$
0.95

 
$
0.80

Net income (loss)
$
8.80

 
$
1.36

 
$
0.95