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Earnings (Loss) Per Share (Tables)
 9 Months Ended
Feb. 28, 2015
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following table summarizes the reconciliation of the numerators and denominators for the basic and diluted earnings (loss) per share computation for the three and nine month periods ended February 28, 2015 and 2014, respectively:
 
Three months ended 
 February 28,
 
Nine months ended 
 February 28,
 
2015
 
2014
 
2015
 
2014
Earnings (loss) from continuing operations attributable to Class A
  and Common Stock
$
(22.1
)
 
$
(12.1
)
 
$
12.4

 
$
16.1

Earnings (loss) from discontinued operations attributable to Class
  A and Common Stock, net of tax
(0.0
)
 
0.0

 
(0.2
)
 
0.2

Net income (loss) attributable to Class A and Common Stock
$
(22.1
)
 
$
(12.1
)
 
$
12.2

 
$
16.3

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

 
32.0

 
32.6

 
31.9

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

 
—

 
0.6

 
0.5

Adjusted weighted average Shares of Class A Stock and Common
  Stock outstanding for diluted earnings (loss) per share (in
    millions)
32.7

 
32.0

 
33.2

 
32.4

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

 
 

 
 

 
 

Basic earnings (loss) per share:
 

 
 

 
 

 
 

Earnings (loss) from continuing operations
$
(0.68
)
 
$
(0.38
)
 
$
0.38

 
$
0.50

Earnings (loss) from discontinued operations, net of tax
$
(0.00
)
 
$
0.00

 
$
(0.01
)
 
$
0.01

Net income (loss)
$
(0.68
)
 
$
(0.38
)
 
$
0.37

 
$
0.51

Diluted earnings (loss) per share:
 

 
 

 
 

 
 

Earnings (loss) from continuing operations
$
(0.68
)
 
$
(0.38
)
 
$
0.37

 
$
0.50

Earnings (loss) from discontinued operations, net of tax
$
(0.00
)
 
$
0.00

 
$
(0.00
)
 
$
0.00

Net income (loss)
$
(0.68
)
 
$
(0.38
)
 
$
0.37

 
$
0.50
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
The following table sets forth Options outstanding pursuant to stock-based compensation plans as of the dates indicated: 
 
February 28, 2015
 
February 28, 2014
Options outstanding pursuant to stock-based compensation plans (in millions)
4.4
 
4.4