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Goodwill and Other Intangibles (Tables)
 3 Months Ended
Aug. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Activity in Goodwill for the Periods Indicated
The following table summarizes the activity in Goodwill for the periods indicated: 
 
Three months ended 
 August 31, 2016
 
Twelve months ended
May 31, 2016
 
Three months ended 
 August 31, 2015
Beginning balance
$
116.2

 
$
116.3

 
$
116.3

Foreign currency translation
0.1

 
(0.1
)
 
(0.1
)
Total goodwill
$
116.3

 
$
116.2

 
$
116.2
Summary of Activity in Total Other Intangibles for the Periods Indicated
The following table summarizes the activity in Total other intangibles for the periods indicated:
 
Three months ended 
 August 31, 2016
 
Twelve months ended
May 31, 2016
 
Three months ended 
 August 31, 2015
Beginning balance - Other intangibles subject to amortization
$
4.7

 
$
4.7

 
$
4.7

Additions
0.2

 
2.4

 
0.5

Amortization expense
(0.6
)
 
(2.2
)
 
(0.5
)
Foreign currency translation
(0.1
)
 
(0.2
)
 
(0.0
)
Total other intangibles subject to amortization,
  net of accumulated amortization of $20.1,
   $19.5 and $17.8, respectively
$
4.2

 
$
4.7

 
$
4.7

Total other intangibles not subject to
  amortization
$
2.1

 
$
2.1

 
$
2.1

Total other intangibles
$
6.3

 
$
6.8

 
$
6.8