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Investment Income, Net (Tables)
 3 Months Ended
Aug. 31, 2014
Investment Income, Net [Abstract]  
Schedule of Investment Income, Net [Table Text Block]
Investment income, net, consisted of the following items:
 
 
For the three months ended
August 31,
In millions
 
2014
 
2013
Interest income on corporate funds
 
$
1.9

 
$
1.6

Interest expense
 
(0.3
)
 
(0.4
)
Net loss from equity-method investments
 
(0.2
)
 
—

Investment income, net
 
$
1.4

 
$
1.2