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Earnings (Loss) Per Share (Tables)
 3 Months Ended
Aug. 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 three month periods ended August 31, 2015 and 2014, respectively:
 
Three months ended 
 August 31,
 
 
2015
 
2014
 
Earnings (loss) from continuing operations attributable to Class A
  and Common Shares
$
(48.9
)
 
$
(53.9
)
 
Earnings (loss) from discontinued operations attributable to Class
  A and Common Shares, net of tax
(0.5
)
 
19.8

 
Net income (loss) attributable to Class A and Common Shares
$
(49.4
)
 
$
(34.1
)
 
Weighted average Shares of Class A Stock and Common Stock
  outstanding for basic earnings (loss) per share (in millions)
33.4

 
32.4

 
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)
*

 
*

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

 
 

 
Basic earnings (loss) per share:
 

 
 

 
Earnings (loss) from continuing operations
$
(1.46
)
 
$
(1.67
)
 
Earnings (loss) from discontinued operations, net of tax
$
(0.02
)
 
$
0.62

 
Net income (loss)
$
(1.48
)
 
$
(1.05
)
 
Diluted earnings (loss) per share:
 

 
 

 
Earnings (loss) from continuing operations
$
(1.46
)
 
$
(1.67
)
 
Earnings (loss) from discontinued operations, net of tax
$
(0.02
)
 
$
0.62

 
Net income (loss)
$
(1.48
)
 
$
(1.05
)
 
Schedule of stock option activity
The following table sets forth Options outstanding pursuant to stock-based compensation plans as of the dates indicated: 
 
August 31, 2015
 
August 31, 2014
Options outstanding pursuant to stock-based compensation plans (in millions)
3.1
 
4.0