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Earnings (Loss) Per Share (Tables)
 9 Months Ended
Feb. 28, 2014
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, 2014 and 2013, respectively:
 
Three months ended February 28,
 
Nine months ended February 28,
 
2014
 
2013
 
2014
 
2013
Earnings (loss) from continuing operations attributable to Class A and Common Shares
$
(12.1
)
 
$
(19.9
)
 
$
16.1

 
$
10.9

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

 
(0.2
)
 
0.2

 
(1.4
)
Net income (loss) attributable to Class A and Common Shares
$
(12.1
)
 
$
(20.1
)
 
$
16.3

 
$
9.5

Weighted average Shares of Class A Stock and Common Stock outstanding for basic earnings (loss) per share (in millions)
32.0

 
32.0

 
31.9

 
31.8

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

 
—

 
0.5

 
0.6

Adjusted weighted average Shares of Class A Stock and Common Stock outstanding for diluted earnings (loss) per share (in millions)
32.0

 
32.0

 
32.4

 
32.4

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

 
 

 
 

 
 

Basic earnings (loss) per share:
 

 
 

 
 

 
 

Earnings (loss) from continuing operations
$
(0.38
)
 
$
(0.62
)
 
$
0.50

 
$
0.34

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

 
$
(0.01
)
 
$
0.01

 
$
(0.04
)
Net income (loss)
$
(0.38
)
 
$
(0.63
)
 
$
0.51

 
$
0.30

Diluted earnings (loss) per share:
 

 
 

 
 

 
 

Earnings (loss) from continuing operations
$
(0.38
)
 
$
(0.62
)
 
$
0.50

 
$
0.34

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

 
$
(0.01
)
 
$
0.00

 
$
(0.05
)
Net income (loss)
$
(0.38
)
 
$
(0.63
)
 
$
0.50

 
$
0.29
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, 2014
 
February 28, 2013
Options outstanding pursuant to stock-based compensation plans (in millions)
4.4
 
4.2