Investments (Tables)
9 Months Ended
Feb. 28, 2014
Investments, Debt and Equity Securities [Abstract]  
Summary of Company's Investment Securities
At February 28, 2014, the Company’s investment securities were classified as follows:
 
 
Amortized
 
Unrealized
 
Fair
(in millions)
Cost
 
Gains
 
Losses
 
Value
Available-for-sale:
 
 
 
 
 
 
 
Equity securities
$
0.2

 
$
0.5

 
$
(0.2
)
 
$
0.5

Time deposit
15.9

 
1.1

 

 
17.0

Greek bonds
1.1

 
6.6

 

 
7.7

Total available-for-sale investments
$
17.2

 
$
8.2

 
$
(0.2
)
 
$
25.2

 
 
Amortized
 
Realized
 
Fair
 
Cost
 
Gains
 
Losses
 
Value
Trading:
 
 
 
 
 
 
 
Equity securities
$
1.6

 
$
0.2

 
$

 
$
1.8

Total trading investments
$
1.6

 
$
0.2

 
$

 
$
1.8

At May 31, 2013, the Company’s investment securities were classified as follows:
 
 
Amortized
 
Unrealized
 
Fair
(in millions)
Cost
 
Gains
 
Losses
 
Value
Available-for-sale:
 
 
 
 
 
 
 
Equity securities
$
0.2

 
$
0.2

 
$

 
$
0.4

Time deposit
15.9

 
0.1

 

 
16.0

Greek bonds
1.1

 
4.5

 

 
5.6

Total available-for-sale investments
$
17.2

 
$
4.8

 
$

 
$
22.0

 
 
 
 
 
 
 
 
 
Amortized
 
Realized
 
Fair
 
Cost
 
Gains
 
Losses
 
Value
Trading:
 
 
 
 
 
 
 
Equity securities
$
0.8

 
$
0.2

 
$

 
$
1.0

Total trading investments
$
0.8

 
$
0.2

 
$

 
$
1.0